Update widget geometries when transforming a layer

Update widget geometries when transforming a layer

Previously widget geometries were only updated during actual layouts.
However if only the transform of a layer is changed, this doesn't cause
a layout and can result in stale widget geometries. In the linked bug
this causes a FrameView to remain throttled even though its transform
was changed to make the FrameView visible again.

BUG=601353
Review URL: https://codereview.chromium.org/1884603004

Cr-Commit-Position: refs/heads/master@{#387271}
(cherry picked from commit 0265532ea6ef8cfdccbe411647bbdb2b4e7c07c8)

Committed: https://chromium.googlesource.com/chromium/src/+/782ddcd39bb723f7d496b1791967c47ff7d74572

[Sami, 2016-04-15 13:10:40]

Description was changed from

==========
Update widget geometries when transforming a layer

Previously widget geometries were only updated during actual layouts.
However if only the transform of a layer is changed, this doesn't cause
a layout and can result in stale widget geometries. In the linked bug
this causes a FrameView to remain throttled even though its transform
was changed to make the FrameView visible again.

BUG=601353

Review URL: https://codereview.chromium.org/1884603004

Cr-Commit-Position: refs/heads/master@{#387271}
(cherry picked from commit 0265532ea6ef8cfdccbe411647bbdb2b4e7c07c8)
==========

to

==========
Update widget geometries when transforming a layer

Previously widget geometries were only updated during actual layouts.
However if only the transform of a layer is changed, this doesn't cause
a layout and can result in stale widget geometries. In the linked bug
this causes a FrameView to remain throttled even though its transform
was changed to make the FrameView visible again.

BUG=601353

Review URL: https://codereview.chromium.org/1884603004

Cr-Commit-Position: refs/heads/master@{#387271}
(cherry picked from commit 0265532ea6ef8cfdccbe411647bbdb2b4e7c07c8)

Committed:
https://chromium.googlesource.com/chromium/src/+/782ddcd39bb723f7d496b1791967...
==========

[Sami, 2016-04-15 13:10:41]

Committed patchset #1 (id:1) manually as
782ddcd39bb723f7d496b1791967c47ff7d74572.