[refactor] Fix autofill features for payments when the form is inside an OOPIF

[refactor] Fix autofill features for payments when the form is inside an OOPIF

Currently, clicking into a credit card information <input> field inside an
OOPIF does not pop up the autofill window. The root cause is simply because
the call to RenderWidget::FocusChangeComplete() is dropped for OOPIFs.
Moreover, for the main frame, this call is forwarded throught
RenderViewObserver calls to the corresponding PageClickTracker.

On the other hand, both PageClickTracker and AutofillAgent use a internal
Legacy class to observe RenderView for updates in element focus and mouse down
down inside a node. This is unfortunate given that the actual classes are
RenderFrameObservers.

This CL will make the following changes:

A) FocusChangeComplete:
This call is now forwarded to the observers of the RenderWidget which are
RenderFrames. They will then notify their own observers, e.g., AutofillAgent
and PageClickTracker. In line with this, the Legacy classes inside these
classes will be removed. Also, there is no longer a need for
RenderViewImpl::RenderWidgetFocusChangeComplete.

B) MouseDown:
Currently, in response to a left mouse button down or a gesture tap, ChromeClient
notifies the WebViewClient (RenderViewImpl). This is solely used in
PageClickTracker. This CL will remove the call from WebViewClient to the
WebWidgetClient (RenderWidget) which similarly to FocusChangeComplete, will be
forwarded to the observer RenderFrames and eventually the RenderFrameObservers.

The change in A) will also fix a bug with credit card payment autofill in
OOPIFs.

BUG=712754, 703800, 583347, 433486
Review-Url: https://codereview.chromium.org/2766053002
Cr-Commit-Position: refs/heads/master@{#466078}
(cherry picked from commit 27ca69b1e049f9f86e15f34420eeef224335f075)

Review-Url: https://codereview.chromium.org/2853623002 .
Cr-Commit-Position: refs/branch-heads/3071@{#304}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/ca19e7c02d4e92fbf88d3d52b25d1e5760e408eb

[EhsanK, 2017-04-28 21:46:27]

Description was changed from

==========
[refactor] Fix autofill features for payments when the form is inside an OOPIF

Currently, clicking into a credit card information <input> field inside an
OOPIF does not pop up the autofill window. The root cause is simply because
the call to RenderWidget::FocusChangeComplete() is dropped for OOPIFs.
Moreover, for the main frame, this call is forwarded throught
RenderViewObserver calls to the corresponding PageClickTracker.

On the other hand, both PageClickTracker and AutofillAgent use a internal
Legacy class to observe RenderView for updates in element focus and mouse down
down inside a node. This is unfortunate given that the actual classes are
RenderFrameObservers.

This CL will make the following changes:

A) FocusChangeComplete:
This call is now forwarded to the observers of the RenderWidget which are
RenderFrames. They will then notify their own observers, e.g., AutofillAgent
and PageClickTracker. In line with this, the Legacy classes inside these
classes will be removed. Also, there is no longer a need for
RenderViewImpl::RenderWidgetFocusChangeComplete.

B) MouseDown:
Currently, in response to a left mouse button down or a gesture tap,
ChromeClient
notifies the WebViewClient (RenderViewImpl). This is solely used in
PageClickTracker. This CL will remove the call from WebViewClient to the
WebWidgetClient (RenderWidget) which similarly to FocusChangeComplete, will be
forwarded to the observer RenderFrames and eventually the RenderFrameObservers.

The change in A) will also fix a bug with credit card payment autofill in
OOPIFs.

BUG=712754,703800, 583347, 433486

Review-Url: https://codereview.chromium.org/2766053002
Cr-Commit-Position: refs/heads/master@{#466078}
(cherry picked from commit 27ca69b1e049f9f86e15f34420eeef224335f075)
==========

to

==========
[refactor] Fix autofill features for payments when the form is inside an OOPIF

Currently, clicking into a credit card information <input> field inside an
OOPIF does not pop up the autofill window. The root cause is simply because
the call to RenderWidget::FocusChangeComplete() is dropped for OOPIFs.
Moreover, for the main frame, this call is forwarded throught
RenderViewObserver calls to the corresponding PageClickTracker.

On the other hand, both PageClickTracker and AutofillAgent use a internal
Legacy class to observe RenderView for updates in element focus and mouse down
down inside a node. This is unfortunate given that the actual classes are
RenderFrameObservers.

This CL will make the following changes:

A) FocusChangeComplete:
This call is now forwarded to the observers of the RenderWidget which are
RenderFrames. They will then notify their own observers, e.g., AutofillAgent
and PageClickTracker. In line with this, the Legacy classes inside these
classes will be removed. Also, there is no longer a need for
RenderViewImpl::RenderWidgetFocusChangeComplete.

B) MouseDown:
Currently, in response to a left mouse button down or a gesture tap,
ChromeClient
notifies the WebViewClient (RenderViewImpl). This is solely used in
PageClickTracker. This CL will remove the call from WebViewClient to the
WebWidgetClient (RenderWidget) which similarly to FocusChangeComplete, will be
forwarded to the observer RenderFrames and eventually the RenderFrameObservers.

The change in A) will also fix a bug with credit card payment autofill in
OOPIFs.

BUG=712754,703800, 583347, 433486

Review-Url: https://codereview.chromium.org/2766053002
Cr-Commit-Position: refs/heads/master@{#466078}
(cherry picked from commit 27ca69b1e049f9f86e15f34420eeef224335f075)

Review-Url: https://codereview.chromium.org/2853623002 .
Cr-Commit-Position: refs/branch-heads/3071@{#304}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/ca19e7c02d4e92fbf88d3d52b25d...
==========

[EhsanK, 2017-04-28 21:46:29]

Committed patchset #1 (id:1) manually as
ca19e7c02d4e92fbf88d3d52b25d1e5760e408eb.