Make a bitmaprenderer canvas an ImageSource

Make a bitmaprenderer canvas an ImageSource

At this moment, we cannot correct handle drawImage or createImageBitmap
with a source canvas that is associated with an ImageBitmapRenderingContext.
This CL makes sure that the canvas can be an ImageSource. Layout tests
are added.

BUG=663793
Committed: https://crrev.com/48c029113eb4338243d99dbc76f85896be8f3a22
Cr-Commit-Position: refs/heads/master@{#431950}

[xidachen, 2016-11-13 03:20:13]

xidachen@chromium.org changed reviewers:
+ junov@chromium.org

[xidachen, 2016-11-13 03:20:13]

PTAL.

Turns out the changes are relatively small.

[Justin Novosad, 2016-11-14 17:44:35]

lgtm

BTW, You just made me realize that I need to make placeholder canvases work with
createImageBitmap.  I will file a bug, to do that in a follow-up CL.

[xidachen, 2016-11-14 17:50:05]

The CQ bit was checked by xidachen@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-14 17:50:29]

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

[xidachen, 2016-11-14 18:36:17]

The CQ bit was unchecked by xidachen@chromium.org

[xidachen, 2016-11-14 18:55:56]

The CQ bit was checked by xidachen@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-14 18:56:59]

Dry run: 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, 2016-11-14 20:25:09]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-11-14 20:25:10]

Dry run: This issue passed the CQ dry run.

[xidachen, 2016-11-14 20:25:30]

The CQ bit was checked by xidachen@chromium.org

[xidachen, 2016-11-14 20:25:31]

The patchset sent to the CQ was uploaded after l-g-t-m from junov@chromium.org
Link to the patchset: https://codereview.chromium.org/2496013002/#ps20001
(title: "remove the expected.txt because the test is passing")

[commit-bot: I haz the power, 2016-11-14 20:26:52]

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, 2016-11-14 23:10:39]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-14 23:12:58]

Description was changed from

==========
Make a bitmaprenderer canvas an ImageSource

At this moment, we cannot correct handle drawImage or createImageBitmap
with a source canvas that is associated with an ImageBitmapRenderingContext.
This CL makes sure that the canvas can be an ImageSource. Layout tests
are added.

BUG=663793
==========

to

==========
Make a bitmaprenderer canvas an ImageSource

At this moment, we cannot correct handle drawImage or createImageBitmap
with a source canvas that is associated with an ImageBitmapRenderingContext.
This CL makes sure that the canvas can be an ImageSource. Layout tests
are added.

BUG=663793

Committed: https://crrev.com/48c029113eb4338243d99dbc76f85896be8f3a22
Cr-Commit-Position: refs/heads/master@{#431950}
==========

[commit-bot: I haz the power, 2016-11-14 23:12:59]

Patchset 2 (id:??) landed as
https://crrev.com/48c029113eb4338243d99dbc76f85896be8f3a22
Cr-Commit-Position: refs/heads/master@{#431950}