The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6130f3dd3af923ec847c32372351495d5b8878fd

commit 6130f3dd3af923ec847c32372351495d5b8878fd
Author: skobes <skobes@chromium.org>
Date: Fri May 19 05:46:28 2017

Kill ScrollbarModesCalculationStrategy.

This was added in http://crrev.com/9de09a32, but I don't think it makes sense
anymore.  Its purpose is to include child frames in FV::scrollable_areas_ even
if their scrollbars have been suppressed by FV::SetCanHaveScrollbars(false).
But such frames are not scrollable by user input (see FV::UserInputScrollable
which examines the ScrollbarMode values), so there is no need for them to be in
FV::scrollable_areas_.

BUG= 724309 

Review-Url: https://codereview.chromium.org/2894733002
Cr-Commit-Position: refs/heads/master@{#473100}

[modify] https://crrev.com/6130f3dd3af923ec847c32372351495d5b8878fd/third_party/WebKit/Source/core/frame/FrameView.cpp
[modify] https://crrev.com/6130f3dd3af923ec847c32372351495d5b8878fd/third_party/WebKit/Source/core/frame/FrameView.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1c38965c165d21706028861200fab06b1eca0bea

commit 1c38965c165d21706028861200fab06b1eca0bea
Author: skobes <skobes@chromium.org>
Date: Mon May 22 21:13:47 2017

Move CalculateScrollbarModes from FrameView to LayoutView.

This is a better place given that it is used by both FrameView and the root
PaintLayerScrollableArea.

SetCanHaveScrollbars remains on FrameView, but with a comment to clarify that it
is RLS-aware.

BUG= 724309 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2900513002
Cr-Commit-Position: refs/heads/master@{#473695}

[modify] https://crrev.com/1c38965c165d21706028861200fab06b1eca0bea/third_party/WebKit/Source/core/frame/FrameView.cpp
[modify] https://crrev.com/1c38965c165d21706028861200fab06b1eca0bea/third_party/WebKit/Source/core/frame/FrameView.h
[modify] https://crrev.com/1c38965c165d21706028861200fab06b1eca0bea/third_party/WebKit/Source/core/layout/LayoutView.cpp
[modify] https://crrev.com/1c38965c165d21706028861200fab06b1eca0bea/third_party/WebKit/Source/core/layout/LayoutView.h
[modify] https://crrev.com/1c38965c165d21706028861200fab06b1eca0bea/third_party/WebKit/Source/core/page/SpatialNavigation.cpp
[modify] https://crrev.com/1c38965c165d21706028861200fab06b1eca0bea/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp