Revert of Move compositor InputHandler from RenderViewImpl to RenderWidget.

Revert of Move compositor InputHandler from RenderViewImpl to RenderWidget. (patchset #29 id:690001 of https://codereview.chromium.org/2479663002/ )

Reason for revert:
Causes flaky failures of SitePerProcessInteractiveBrowserTest.SubframeKeyboardEventRouting.

Original issue's description:
> Move compositor InputHandler from RenderViewImpl to RenderWidget.
> 
> At present the input handler for cross-process iframes is installed 
> only on the RenderViewImpl, meaning that events sent to them can only
> be handled on the main thread (instead of the compositor thread).
> 
> Note: The compositor layer tree on the RenderViewImpl for a cross-
> process frame renderer is actually empty.
> 
> This CL attaches an input handler to each RenderWidget instead, 
> allowing compositor-thread handling of input events for all
> the frames. This is a precursor for handling GesturePinch events for
> subframes.
> 
> BUG=654917
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
> 
> Review-Url: https://codereview.chromium.org/2479663002
> Cr-Commit-Position: refs/heads/master@{#445175}
> Committed: https://chromium.googlesource.com/chromium/src/+/efd05aec93fad28adb8bef9674530e7bbe64766f

TBR=enne@chromium.org,avi@chromium.org,dcheng@chromium.org,lfg@chromium.org,wjmaclean@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=654917
Review-Url: https://codereview.chromium.org/2649573003
Cr-Commit-Position: refs/heads/master@{#445231}
Committed: https://chromium.googlesource.com/chromium/src/+/b5ac0ebfe4e03b8e1da707fa38f29550022a94ea

[waffles, 2017-01-21 00:49:04]

The CQ bit was checked by waffles@chromium.org

[waffles, 2017-01-21 00:49:04]

Created Revert of Move compositor InputHandler from RenderViewImpl to
RenderWidget.

[commit-bot: I haz the power, 2017-01-21 00:49:24]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-21 00:50:31]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484959744374800, "parent_rev":
"ff5b9223b5841e297444ddfd05b7c4380773d764", "commit_rev":
"b5ac0ebfe4e03b8e1da707fa38f29550022a94ea"}

[commit-bot: I haz the power, 2017-01-21 00:51:00]

Description was changed from

==========
Revert of Move compositor InputHandler from RenderViewImpl to RenderWidget.
(patchset #29 id:690001 of https://codereview.chromium.org/2479663002/ )

Reason for revert:
Causes flaky failures of
SitePerProcessInteractiveBrowserTest.SubframeKeyboardEventRouting.

Original issue's description:
> Move compositor InputHandler from RenderViewImpl to RenderWidget.
> 
> At present the input handler for cross-process iframes is installed 
> only on the RenderViewImpl, meaning that events sent to them can only
> be handled on the main thread (instead of the compositor thread).
> 
> Note: The compositor layer tree on the RenderViewImpl for a cross-
> process frame renderer is actually empty.
> 
> This CL attaches an input handler to each RenderWidget instead, 
> allowing compositor-thread handling of input events for all
> the frames. This is a precursor for handling GesturePinch events for
> subframes.
> 
> BUG=654917
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
> 
> Review-Url: https://codereview.chromium.org/2479663002
> Cr-Commit-Position: refs/heads/master@{#445175}
> Committed:
https://chromium.googlesource.com/chromium/src/+/efd05aec93fad28adb8bef967453...

TBR=enne@chromium.org,avi@chromium.org,dcheng@chromium.org,lfg@chromium.org,w...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=654917
==========

to

==========
Revert of Move compositor InputHandler from RenderViewImpl to RenderWidget.
(patchset #29 id:690001 of https://codereview.chromium.org/2479663002/ )

Reason for revert:
Causes flaky failures of
SitePerProcessInteractiveBrowserTest.SubframeKeyboardEventRouting.

Original issue's description:
> Move compositor InputHandler from RenderViewImpl to RenderWidget.
> 
> At present the input handler for cross-process iframes is installed 
> only on the RenderViewImpl, meaning that events sent to them can only
> be handled on the main thread (instead of the compositor thread).
> 
> Note: The compositor layer tree on the RenderViewImpl for a cross-
> process frame renderer is actually empty.
> 
> This CL attaches an input handler to each RenderWidget instead, 
> allowing compositor-thread handling of input events for all
> the frames. This is a precursor for handling GesturePinch events for
> subframes.
> 
> BUG=654917
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
> 
> Review-Url: https://codereview.chromium.org/2479663002
> Cr-Commit-Position: refs/heads/master@{#445175}
> Committed:
https://chromium.googlesource.com/chromium/src/+/efd05aec93fad28adb8bef967453...

TBR=enne@chromium.org,avi@chromium.org,dcheng@chromium.org,lfg@chromium.org,w...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=654917

Review-Url: https://codereview.chromium.org/2649573003
Cr-Commit-Position: refs/heads/master@{#445231}
Committed:
https://chromium.googlesource.com/chromium/src/+/b5ac0ebfe4e03b8e1da707fa38f2...
==========

[commit-bot: I haz the power, 2017-01-21 00:51:01]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/b5ac0ebfe4e03b8e1da707fa38f2...