The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c9cc06afc9329f475cf5efd244cc80f713728873

commit c9cc06afc9329f475cf5efd244cc80f713728873
Author: majidvp <majidvp@chromium.org>
Date: Fri Jun 24 21:58:30 2016

Validate that ui::Event::time_stamp comes from the same clock as TimeTicks::Now

Generalize existing X11 event timestamp's clock mismatch detection logic and use
it on all platforms. On X11 deviation from system clock is not exceptional so
after  detection we correct by falling back to TimeTicks::Now(). On all other
platforms, this is an exception so we assert and fail (only on DCHECK builds).

Other changes:
- add hooks to allow mocking underlying tick clock used in ui/events.
- fix bug in textfield double click detection logic where small timestamp values
led to breakage.

BUG= 614409 

Review-Url: https://codereview.chromium.org/2007083002
Cr-Commit-Position: refs/heads/master@{#401987}

[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper_browsertest.mm
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/chromeos/ui_chromeos.gyp
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/events/base_event_utils.cc
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/events/base_event_utils.h
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/events/cocoa/events_mac.mm
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/events/event_utils.cc
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/events/event_utils.h
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/events/test/event_generator.cc
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/events/win/events_win.cc
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/events/x/events_x.cc
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/events/x/events_x_utils.cc
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/message_center/message_center.gyp
[modify] https://crrev.com/c9cc06afc9329f475cf5efd244cc80f713728873/ui/views/controls/textfield/textfield.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0eee00fdfb2ac517e576624a3766904dd95bffbb

commit 0eee00fdfb2ac517e576624a3766904dd95bffbb
Author: majidvp <majidvp@chromium.org>
Date: Tue Jul 05 18:20:47 2016

Remove unnecessary mocking of TickClock for events

It is possible now to mock the clock used in ui/events so it is
no longer necessary to have these individual mock tick clocks
for events.

BUG= 614409 

Review-Url: https://codereview.chromium.org/2100453002
Cr-Commit-Position: refs/heads/master@{#403805}

[modify] https://crrev.com/0eee00fdfb2ac517e576624a3766904dd95bffbb/ash/system/web_notification/web_notification_tray_unittest.cc
[modify] https://crrev.com/0eee00fdfb2ac517e576624a3766904dd95bffbb/components/exo/touch_unittest.cc
[modify] https://crrev.com/0eee00fdfb2ac517e576624a3766904dd95bffbb/ui/chromeos/touch_exploration_controller.cc
[modify] https://crrev.com/0eee00fdfb2ac517e576624a3766904dd95bffbb/ui/chromeos/touch_exploration_controller.h
[modify] https://crrev.com/0eee00fdfb2ac517e576624a3766904dd95bffbb/ui/chromeos/touch_exploration_controller_unittest.cc
[modify] https://crrev.com/0eee00fdfb2ac517e576624a3766904dd95bffbb/ui/events/test/event_generator.cc
[modify] https://crrev.com/0eee00fdfb2ac517e576624a3766904dd95bffbb/ui/events/test/event_generator.h