Ensure canvas state is preserved when 2d canvas falls out of display list mode

Ensure canvas state is preserved when 2d canvas falls out of display list mode

This change adds code to save and replay the canvas state stack when
transferring from a display list to a raste canvas

BUG=423913
TEST=fast/canvas/canvas-unballanced-save.html

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=183904

[Justin Novosad, 2014-10-16 17:16:15]

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

[Justin Novosad, 2014-10-16 17:16:16]

PTAL

[Stephen White, 2014-10-16 17:39:09]

Nit: unballanced -> unbalanced

[Stephen White, 2014-10-16 17:40:47]

LGTM w/nits

https://codereview.chromium.org/661763003/diff/1/LayoutTests/fast/canvas/canv...
File LayoutTests/fast/canvas/canvas-unballanced-save.html (right):

https://codereview.chromium.org/661763003/diff/1/LayoutTests/fast/canvas/canv...
LayoutTests/fast/canvas/canvas-unballanced-save.html:27: }
Nit: weird indentation here.

[Justin Novosad, 2014-10-16 18:05:02]

https://codereview.chromium.org/661763003/diff/1/LayoutTests/fast/canvas/canv...
File LayoutTests/fast/canvas/canvas-unballanced-save.html (right):

https://codereview.chromium.org/661763003/diff/1/LayoutTests/fast/canvas/canv...
LayoutTests/fast/canvas/canvas-unballanced-save.html:27: }
On 2014/10/16 17:40:47, Stephen White wrote:
> Nit: weird indentation here.
Looks like presubmit script does not warn about tab characters in layout tests.

[Justin Novosad, 2014-10-16 18:08:09]

new patch

[Stephen White, 2014-10-16 18:57:12]

LGTM

[Justin Novosad, 2014-10-16 18:58:24]

The CQ bit was checked by junov@chromium.org

[commit-bot: I haz the power, 2014-10-16 18:59:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/661763003/20001

[commit-bot: I haz the power, 2014-10-16 19:06:04]

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

[commit-bot: I haz the power, 2014-10-16 19:06:05]

Try jobs failed on following builders:
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[Justin Novosad, 2014-10-17 16:08:05]

The CQ bit was checked by junov@chromium.org

[commit-bot: I haz the power, 2014-10-17 16:09:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/661763003/20001

[commit-bot: I haz the power, 2014-10-17 17:21:00]

Committed patchset #2 (id:20001) as 183904