cc: Fix tiling raster tile iterator to handle initializing tiles.

cc: Fix tiling raster tile iterator to handle initializing tiles.

This patch ensures that if a tile is initialized mid-iteration (as is
desirable in some unittests), then it will continue working as expected.

R=reveman

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=273025

[reveman, 2014-05-21 22:24:41]

lgtm

[vmpstr, 2014-05-21 22:29:05]

The CQ bit was checked by vmpstr@chromium.org

[commit-bot: I haz the power, 2014-05-21 22:31:54]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vmpstr@chromium.org/295933008/1

[commit-bot: I haz the power, 2014-05-22 05:47:34]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  win_chromium_compile_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_compile_...)
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)
  win_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu/builds/10997)

[commit-bot: I haz the power, 2014-05-22 07:37:59]

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

[commit-bot: I haz the power, 2014-05-22 07:38:00]

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

[vmpstr, 2014-05-27 17:32:21]

The CQ bit was checked by vmpstr@chromium.org

[commit-bot: I haz the power, 2014-05-27 17:32:49]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vmpstr@chromium.org/295933008/10001

[commit-bot: I haz the power, 2014-05-27 21:03:04]

Change committed as 273025