Use SaveLayerWithFlags to avoid cpu bitmaps in RoundedCornersImageSource

Use SaveLayerWithFlags to avoid cpu bitmaps in RoundedCornersImageSource

The extention app items want a rounded corner and they do this by
drawing into an intermediate target. We can use gfx::Canvas to
achieve this effect without requiring us to make any bitmaps on
the cpu during paint time.

R=pkasting@chromium.org
BUG=671433
Review-Url: https://codereview.chromium.org/2769203002
Cr-Commit-Position: refs/heads/master@{#459258}
Committed: https://chromium.googlesource.com/chromium/src/+/23a49518b36200b125fb3e14f450e304668a4fc8

[danakj, 2017-03-23 15:09:23]

One more use for SaveLayerWithFlags from a CL I did a few days ago.

[Peter Kasting, 2017-03-23 21:54:41]

LGTM

[danakj, 2017-03-23 21:55:33]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2017-03-23 21:56:04]

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, 2017-03-23 22:29:50]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490306133503800, "parent_rev":
"30fc05395028eb75715e994406397463341e54da", "commit_rev":
"23a49518b36200b125fb3e14f450e304668a4fc8"}

[commit-bot: I haz the power, 2017-03-23 22:30:34]

Description was changed from

==========
Use SaveLayerWithFlags to avoid cpu bitmaps in RoundedCornersImageSource

The extention app items want a rounded corner and they do this by
drawing into an intermediate target. We can use gfx::Canvas to
achieve this effect without requiring us to make any bitmaps on
the cpu during paint time.

R=pkasting@chromium.org
BUG=671433
==========

to

==========
Use SaveLayerWithFlags to avoid cpu bitmaps in RoundedCornersImageSource

The extention app items want a rounded corner and they do this by
drawing into an intermediate target. We can use gfx::Canvas to
achieve this effect without requiring us to make any bitmaps on
the cpu during paint time.

R=pkasting@chromium.org
BUG=671433

Review-Url: https://codereview.chromium.org/2769203002
Cr-Commit-Position: refs/heads/master@{#459258}
Committed:
https://chromium.googlesource.com/chromium/src/+/23a49518b36200b125fb3e14f450...
==========

[commit-bot: I haz the power, 2017-03-23 22:30:35]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/23a49518b36200b125fb3e14f450...