cc: Don't call ReadyToFinalizeTextureUpdates multiple times

cc: Don't call ReadyToFinalizeTextureUpdates multiple times

Today, NotifyReadyToCommit always results in an immediate commit.
However, if we start commits early and have to throttle commits
such that NotifyReadyToCommit doesn't result in an immediate commit,
we might receive multiple calls to NotifyReadyToCommit because it
is possilbe that ResourceUpdateControler might call
ReadyToFinalizeTextureUpdates multiple times before we finish the
commit.

BUG=293941
TEST=ResourceUpdateControllerTest_NoMoreUpdates

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=256190

[brianderson, 2014-03-10 19:01:35]

ptal

This is needed for me to land https://codereview.chromium.org/23907006

[reveman, 2014-03-10 20:19:48]

lgtm

[brianderson, 2014-03-10 20:20:37]

The CQ bit was checked by brianderson@chromium.org

[commit-bot: I haz the power, 2014-03-10 20:24:27]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/brianderson@chromium.org/190543012/1

[commit-bot: I haz the power, 2014-03-10 21:48:00]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/brianderson@chromium.org/190543012/1

[commit-bot: I haz the power, 2014-03-10 22:30:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/brianderson@chromium.org/190543012/1

[commit-bot: I haz the power, 2014-03-10 23:46:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/brianderson@chromium.org/190543012/1

[commit-bot: I haz the power, 2014-03-11 11:06:25]

Change committed as 256190