The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3acb734ff34a77e76228425d06952317c10e252b

commit 3acb734ff34a77e76228425d06952317c10e252b
Author: nzolghadr <nzolghadr@chromium.org>
Date: Wed Aug 17 16:25:32 2016

Refactoring button field and its type

- Remove m_button field from PlatformMouseEvent as
    there was one in WebPointerProperties.
- Remove duplicate PlatformMouseEvent::MouseButton
    and WebScrollbarBehavior::Button enums and use
    WebPointerProperties::Button enum instead.
- Making WebPointerProperties::Button an enum class.

- Also cleanup related target for pointerevents. The related target for all pointerevents (similar to mouseevent) should be null except for boundary events. So relatedTarget can be removed from some of the functions as they don't send boundary events.

BUG= 635670 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

TBR=pfeldman@chromium.org

Review-Url: https://codereview.chromium.org/2227563003
Cr-Commit-Position: refs/heads/master@{#412552}

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[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/chrome/browser/pdf/pdf_extension_test.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/chrome/browser/plugins/plugin_power_saver_browsertest.cc
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[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/chrome/browser/referrer_policy_browsertest.cc
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[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/chrome/test/remoting/remote_desktop_browsertest.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/components/printing/test/print_web_view_helper_browsertest.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/components/test_runner/event_sender.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/components/test_runner/event_sender.h
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[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/devtools/protocol/color_picker.cc
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[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/renderer_host/input/touch_emulator_unittest.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/renderer_host/input/web_input_event_builders_android.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/renderer_host/input/web_input_event_builders_mac.mm
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/renderer_host/input/web_input_event_builders_win.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/renderer_host/render_widget_host_unittest.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/renderer_host/render_widget_host_view_mac.mm
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/renderer_host/web_input_event_aura.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/renderer_host/web_input_event_aura_unittest.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/browser/site_per_process_browsertest.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/common/input/synthetic_web_input_event_builders.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/common/input/web_input_event_traits.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/public/test/render_view_test.cc
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[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/renderer/webscrollbarbehavior_impl_gtkoraura.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/renderer/webscrollbarbehavior_impl_gtkoraura.h
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/renderer/webscrollbarbehavior_impl_mac.h
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/content/renderer/webscrollbarbehavior_impl_mac.mm
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/mojo/converters/blink/blink_input_events_type_converters.cc
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/dom/Node.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/editing/SelectionController.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/events/MouseEvent.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/events/MouseEvent.h
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/events/PointerEventFactory.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/events/PointerEventFactory.h
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/events/PointerEventFactoryTest.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/html/HTMLAnchorElement.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/html/HTMLInputElement.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/html/forms/RangeInputType.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/html/shadow/SpinButtonElement.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/html/shadow/TextControlInnerElements.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/input/EventHandler.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/input/EventHandlerTest.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/input/GestureManager.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/input/PointerEventManager.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/input/PointerEventManager.h
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/layout/LayoutFrameSet.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/page/AutoscrollController.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/core/page/DragController.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/platform/PlatformMouseEvent.h
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/platform/scroll/Scrollbar.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/AssertMatchingEnums.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/WebInputEventConversion.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/WebViewImpl.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/tests/ChromeClientImplTest.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/tests/LinkSelectionTest.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/tests/VisualViewportTest.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/tests/WebInputEventConversionTest.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/tests/WebPluginContainerTest.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/Source/web/tests/WebViewTest.cpp
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/public/platform/WebPointerProperties.h
[modify] https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b/third_party/WebKit/public/platform/WebScrollbarBehavior.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1c1f8f7a786bb441229143629a30048f187bf937

commit 1c1f8f7a786bb441229143629a30048f187bf937
Author: megjablon <megjablon@chromium.org>
Date: Wed Aug 17 23:14:02 2016

Revert of Refactoring button field and its type (patchset #13 id:240001 of https://codereview.chromium.org/2227563003/ )

Reason for revert:
Webkit tests failing on WebKit Linux MSAN

https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN/builds/11748

webkit_tests webkit_tests

unexpected_failures:
imported/wpt/pointerevents/pointerevent_pointertype_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-inherit_child-auto-child-none_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-auto-css_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-pan-x-pan-y-pan-y_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-none-css_touch-manual.html
imported/wpt/pointerevents/pointerevent_change-touch-action-onpointerdown_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-button-test_touch-manual.html
imported/wpt/pointerevents/pointerevent_pointerleave_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-pan-y-css_touch-manual.html
imported/wpt/pointerevents/pointerevent_pointerenter_nohover-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-inherit_highest-parent-none_touch-manual.html
imported/wpt/pointerevents/pointerevent_pointerout_after_pointercancel_touch-manual.html
imported/wpt/pointerevents/pointerevent_pointerleave_after_pointerup_nohover-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-svg-test_touch-manual.html
imported/wpt/pointerevents/pointerevent_pointerout_after_pointerup_nohover-manual.html
imported/wpt/pointerevents/pointerevent_pointerleave_after_pointercancel_touch-manual.html
imported/wpt/pointerevents/pointerevent_releasepointercapture_onpointercancel_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-pan-x-pan-y_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-inherit_parent-none_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-pan-x-css_touch-manual.html
imported/wpt/pointerevents/pointerevent_pointercancel_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-inherit_child-pan-x-child-pan-y_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-table-test_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-span-test_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-inherit_child-none_touch-manual.html
imported/wpt/pointerevents/pointerevent_touch-action-inherit_child-pan-x-child-pan-x_touch-manual.html

Original issue's description:
> Refactoring button field and its type
>
> - Remove m_button field from PlatformMouseEvent as
>     there was one in WebPointerProperties.
> - Remove duplicate PlatformMouseEvent::MouseButton
>     and WebScrollbarBehavior::Button enums and use
>     WebPointerProperties::Button enum instead.
> - Making WebPointerProperties::Button an enum class.
>
> - Also cleanup related target for pointerevents. The related target for all pointerevents (similar to mouseevent) should be null except for boundary events. So relatedTarget can be removed from some of the functions as they don't send boundary events.
>
> BUG= 635670 
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation
>
> TBR=pfeldman@chromium.org
>
> Committed: https://crrev.com/3acb734ff34a77e76228425d06952317c10e252b
> Cr-Commit-Position: refs/heads/master@{#412552}

TBR=pdr@chromium.org,bokan@chromium.org,dtapuska@chromium.org,mustaq@chromium.org,pfeldman@chromium.org,danakj@chromium.org,sky@chromium.org,thestig@chromium.org,nzolghadr@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
BUG= 635670 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2245063006
Cr-Commit-Position: refs/heads/master@{#412684}

[modify] https://crrev.com/1c1f8f7a786bb441229143629a30048f187bf937/chrome/browser/apps/guest_view/web_view_browsertest.cc
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[modify] https://crrev.com/1c1f8f7a786bb441229143629a30048f187bf937/chrome/browser/apps/window_controls_browsertest.cc
[modify] https://crrev.com/1c1f8f7a786bb441229143629a30048f187bf937/chrome/browser/autofill/autofill_browsertest.cc
[modify] https://crrev.com/1c1f8f7a786bb441229143629a30048f187bf937/chrome/browser/autofill/autofill_interactive_uitest.cc
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[modify] https://crrev.com/1c1f8f7a786bb441229143629a30048f187bf937/chrome/browser/chrome_service_worker_browsertest.cc
[modify] https://crrev.com/1c1f8f7a786bb441229143629a30048f187bf937/chrome/browser/chromeos/input_method/textinput_test_helper.cc
[modify] https://crrev.com/1c1f8f7a786bb441229143629a30048f187bf937/chrome/browser/devtools/devtools_sanity_browsertest.cc
[modify] https://crrev.com/1c1f8f7a786bb441229143629a30048f187bf937/chrome/browser/download/download_browsertest.cc
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Just to update the bug here. The original code got reverted due to the change in enum sizes. I thought I can easily change the enum sizes from the default which is int to int8. However, that caused the msan bots give uninitialized check errors. I change the enums sizes back to the default int and re-submit the patch.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/656569e7720f728ee023447a270376ed17754dfc

commit 656569e7720f728ee023447a270376ed17754dfc
Author: nzolghadr <nzolghadr@chromium.org>
Date: Fri Aug 19 16:53:00 2016

Refactoring button field and its type  (2nd try)

- Remove m_button field from PlatformMouseEvent as
    there was one in WebPointerProperties.
- Remove duplicate PlatformMouseEvent::MouseButton
    and WebScrollbarBehavior::Button enums and use
    WebPointerProperties::Button enum instead.
- Making WebPointerProperties::Button an enum class.

- Also cleanup related target for pointerevents. The related target for all pointerevents (similar to mouseevent) should be null except for boundary events. So relatedTarget can be removed from some of the functions as they don't send boundary events.

TBR=pdr@chromium.org, bokan@chromium.org, dtapuska@chromium.org, mustaq@chromium.org, pfeldman@chromium.org, sky@chromium.org, thestig@chromium.org

BUG= 635670 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2252423002
Cr-Commit-Position: refs/heads/master@{#413168}

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[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/content/renderer/webscrollbarbehavior_impl_gtkoraura.h
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/content/renderer/webscrollbarbehavior_impl_mac.h
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/content/renderer/webscrollbarbehavior_impl_mac.mm
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/mojo/converters/blink/blink_input_events_type_converters.cc
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/dom/Node.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/editing/SelectionController.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/events/MouseEvent.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/events/MouseEvent.h
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/events/PointerEventFactory.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/events/PointerEventFactory.h
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/events/PointerEventFactoryTest.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/html/HTMLAnchorElement.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/html/HTMLInputElement.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/html/forms/RangeInputType.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/html/shadow/SpinButtonElement.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/html/shadow/TextControlInnerElements.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/input/EventHandler.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/input/EventHandlerTest.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/input/GestureManager.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/input/PointerEventManager.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/input/PointerEventManager.h
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/layout/LayoutFrameSet.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/page/AutoscrollController.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/core/page/DragController.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/platform/PlatformMouseEvent.h
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/platform/scroll/Scrollbar.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/AssertMatchingEnums.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/ChromeClientImpl.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/WebInputEventConversion.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/WebViewImpl.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/tests/ChromeClientImplTest.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/tests/LinkSelectionTest.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/tests/VisualViewportTest.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/tests/WebInputEventConversionTest.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/tests/WebPluginContainerTest.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/Source/web/tests/WebViewTest.cpp
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/public/platform/WebPointerProperties.h
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/third_party/WebKit/public/platform/WebScrollbarBehavior.h
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/ui/events/blink/web_input_event.cc
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/ui/events/blink/web_input_event_builders_win.cc
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/ui/events/blink/web_input_event_traits.cc
[modify] https://crrev.com/656569e7720f728ee023447a270376ed17754dfc/ui/events/blink/web_input_event_unittest.cc