cc: Switch some pixel tests to use impl-side painting.

cc: Switch some pixel tests to use impl-side painting.

These tests use ContentLayer, so change them to use PictureLayer
instead and stop explicitly disabling impl-side painting.

R=enne
BUG=401492
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=288244

[danakj, 2014-08-07 14:04:54]

I used​ FakePictureLayer here so we could verify the HighResTiling() on the
impl-thread, but there's nothing requiring the use of FakePictureLayer
instead of just PictureLayer in these tests otherwise.

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[enne (OOO), 2014-08-07 17:00:54]

lgtm

[commit-bot: I haz the power, 2014-08-07 17:01:50]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/danakj@chromium.org/443353003/1

[commit-bot: I haz the power, 2014-08-07 18:04:26]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_chromium_gn_compile_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)
  win8_chromium_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_rel...)

[commit-bot: I haz the power, 2014-08-07 18:44:54]

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

[commit-bot: I haz the power, 2014-08-07 18:44:55]

Try jobs failed on following builders:
  win8_chromium_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_rel...)

[danakj, 2014-08-07 23:37:51]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2014-08-08 00:00:44]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/danakj@chromium.org/443353003/1

[commit-bot: I haz the power, 2014-08-08 08:03:33]

Change committed as 288244