Use SkBitmap backing instead of GDI backed platform canvas for tiles

Use SkBitmap backing instead of GDI backed platform canvas for tiles

BUG=321185
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=236625

[jamesr, 2013-11-21 01:53:59]

Vangelis, want to take this for a spin?  I didn't see any obvious text errors on
simple pages but didn't stress it.

[vangelis, 2013-11-21 09:06:33]

On 2013/11/21 01:53:59, jamesr wrote:
> Vangelis, want to take this for a spin?  I didn't see any obvious text errors
on
> simple pages but didn't stress it.

Thanks for putting this together. Sure, let's give it a spin and see how it does
and if it makes any difference in the GDI crashes and perf-bots / paint uma
stats.

LGTM

[jamesr, 2013-11-21 19:53:53]

It looks like the mock theming stuff for winaura isn't done so I can't verify
layout tests locally.  Will see what the trybot thinks.

[jamesr, 2013-11-21 21:04:07]

On 2013/11/21 19:53:53, jamesr wrote:
> It looks like the mock theming stuff for winaura isn't done so I can't verify
> layout tests locally.  Will see what the trybot thinks.

win_layout_rel is green and fast/ pass with use_aura=0 on my box.

[commit-bot: I haz the power, 2013-11-21 21:06:05]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jamesr@chromium.org/80063002/1

[commit-bot: I haz the power, 2013-11-21 23:23:45]

Change committed as 236625