[Layout API] Introduce Layout API shim and use in LayerClipRecorderTest.cpp

[Layout API] Introduce Layout API shim and use in LayerClipRecorderTest.cpp

There are a few final obstacles to removing Document::layoutView() and
FrameView::layoutView(), and they require the use of a shim to bust
through the block layout API. In LayerClipRecorderTest, it gets a
reference to the document's layout view and later passes it to
LayoutObjectDrawingRecorder::useCachedDrawingIfPossible, which in turn
passes it to DrawingRecorder::useCachedDrawingIfPossible, which is
defined in platform/ and can not have a hard dependency on the block
layout API.

BUG=499321
Committed: https://crrev.com/32316ab611ef524477bb285a5c6330605d95946c
Cr-Commit-Position: refs/heads/master@{#397789}

[pilgrim_google, 2016-06-03 14:09:36]

pilgrim@chromium.org changed reviewers:
+ eae@chromium.org, jsbell@chromium.org

[eae, 2016-06-03 20:13:07]

The CQ bit was checked by eae@chromium.org

[eae, 2016-06-03 20:13:07]

lgtm

[commit-bot: I haz the power, 2016-06-03 20:13:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2036213002/1

[commit-bot: I haz the power, 2016-06-03 20:19:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-03 20:20:55]

Description was changed from

==========
[Layout API] Introduce Layout API shim and use in LayerClipRecorderTest.cpp

There are a few final obstacles to removing Document::layoutView() and
FrameView::layoutView(), and they require the use of a shim to bust
through the block layout API. In LayerClipRecorderTest, it gets a
reference to the document's layout view and later passes it to
LayoutObjectDrawingRecorder::useCachedDrawingIfPossible, which in turn
passes it to DrawingRecorder::useCachedDrawingIfPossible, which is
defined in platform/ and can not have a hard dependency on the block
layout API.

BUG=499321
==========

to

==========
[Layout API] Introduce Layout API shim and use in LayerClipRecorderTest.cpp

There are a few final obstacles to removing Document::layoutView() and
FrameView::layoutView(), and they require the use of a shim to bust
through the block layout API. In LayerClipRecorderTest, it gets a
reference to the document's layout view and later passes it to
LayoutObjectDrawingRecorder::useCachedDrawingIfPossible, which in turn
passes it to DrawingRecorder::useCachedDrawingIfPossible, which is
defined in platform/ and can not have a hard dependency on the block
layout API.

BUG=499321

Committed: https://crrev.com/32316ab611ef524477bb285a5c6330605d95946c
Cr-Commit-Position: refs/heads/master@{#397789}
==========

[commit-bot: I haz the power, 2016-06-03 20:20:56]

Patchset 1 (id:??) landed as
https://crrev.com/32316ab611ef524477bb285a5c6330605d95946c
Cr-Commit-Position: refs/heads/master@{#397789}