Mark sub-frame root layer non-fast scrollable when wheel handlers present.

Mark sub-frame root layer non-fast scrollable when wheel handlers present.

Just like with touch event handlers, at present a sub-frame's
compositor does not receive regions rects for non-fast scrollable
regions that accompany MouseWheel handlers. Until ScrollingCoordinator
is made per-frame, we should mark the entire root layer rect as
non-fast scrollable in the presence of blocking wheel handlers.

The primary changes are all in render_widget_compositor.cc; other
files are touched only to give the function a more inclusive name.

BUG=698195
Review-Url: https://codereview.chromium.org/2740133002
Cr-Commit-Position: refs/heads/master@{#456131}
(cherry picked from commit 47b1b819e0e239b1c753ae4e736f77ac9ccafcdd)

Review-Url: https://codereview.chromium.org/2743223003 .
Cr-Commit-Position: refs/branch-heads/3029@{#146}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/e4c4f772242dae97a0503437a4001b5b22a357a7

[wjmaclean, 2017-03-13 13:57:17]

Description was changed from

==========
Mark sub-frame root layer non-fast scrollable when wheel handlers present.

Just like with touch event handlers, at present a sub-frame's
compositor does not receive regions rects for non-fast scrollable
regions that accompany MouseWheel handlers. Until ScrollingCoordinator
is made per-frame, we should mark the entire root layer rect as
non-fast scrollable in the presence of blocking wheel handlers.

The primary changes are all in render_widget_compositor.cc; other
files are touched only to give the function a more inclusive name.

BUG=698195

Review-Url: https://codereview.chromium.org/2740133002
Cr-Commit-Position: refs/heads/master@{#456131}
(cherry picked from commit 47b1b819e0e239b1c753ae4e736f77ac9ccafcdd)
==========

to

==========
Mark sub-frame root layer non-fast scrollable when wheel handlers present.

Just like with touch event handlers, at present a sub-frame's
compositor does not receive regions rects for non-fast scrollable
regions that accompany MouseWheel handlers. Until ScrollingCoordinator
is made per-frame, we should mark the entire root layer rect as
non-fast scrollable in the presence of blocking wheel handlers.

The primary changes are all in render_widget_compositor.cc; other
files are touched only to give the function a more inclusive name.

BUG=698195

Review-Url: https://codereview.chromium.org/2740133002
Cr-Commit-Position: refs/heads/master@{#456131}
(cherry picked from commit 47b1b819e0e239b1c753ae4e736f77ac9ccafcdd)

Review-Url: https://codereview.chromium.org/2743223003 .
Cr-Commit-Position: refs/branch-heads/3029@{#146}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/e4c4f772242dae97a0503437a400...
==========

[wjmaclean, 2017-03-13 13:57:18]

Committed patchset #1 (id:1) manually as
e4c4f772242dae97a0503437a4001b5b22a357a7.