NotifyAllTileTasksCompleted for synchronous renderer compositor

NotifyAllTileTasksCompleted for synchronous renderer compositor

This change ensures that in cases where no work is enqueued on the tile manager when we background, the NotifyAllTileTasksCompleted signal is still delivered.

Added a test to ensure that we call the appropriate callback in the synchronous renderer case.

BUG=505495
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Committed: https://crrev.com/0e28d110ce80a66d42268cce003e792edfef0006
Cr-Commit-Position: refs/heads/master@{#338589}

[ericrk, 2015-07-11 18:01:49]

ericrk@chromium.org changed reviewers:
+ boliu@chromium.org, enne@chromium.org

[ericrk, 2015-07-11 18:01:59]

Patchset #1 (id:1) has been deleted

[enne (OOO), 2015-07-13 17:51:58]

lgtm

[ericrk, 2015-07-13 20:08:20]

The CQ bit was checked by ericrk@chromium.org

[commit-bot: I haz the power, 2015-07-13 20:08:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1228323004/20001

[commit-bot: I haz the power, 2015-07-13 20:12:22]

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

[commit-bot: I haz the power, 2015-07-13 20:12:23]

Try jobs failed on following builders:
  linux_chromium_compile_dbg_32_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

(exceeded global retry quota)

[ericrk, 2015-07-13 21:01:36]

The CQ bit was checked by ericrk@chromium.org

[ericrk, 2015-07-13 21:01:36]

The patchset sent to the CQ was uploaded after l-g-t-m from enne@chromium.org
Link to the patchset: https://codereview.chromium.org/1228323004/#ps40001
(title: "rebase")

[commit-bot: I haz the power, 2015-07-13 21:03:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1228323004/40001

[commit-bot: I haz the power, 2015-07-13 23:32:17]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-07-13 23:33:25]

Patchset 2 (id:??) landed as
https://crrev.com/0e28d110ce80a66d42268cce003e792edfef0006
Cr-Commit-Position: refs/heads/master@{#338589}

[ericrk, 2015-07-14 18:44:34]

Patchset #3 (id:60001) has been deleted