[chromium] Roll Chromium DEPS to 177676

Unreviewed DEPS roll.

* DEPS:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140190 268f45cc-cd09-0410-ab3c-d52691b4dbfc
[BlackBerry] When acquiring/releasing backing store memory, allow web page client control suspend/resuming of backing store
https://bugs.webkit.org/show_bug.cgi?id=107307

Patch by Andrew Lo <anlo@rim.com> on 2013-01-18
Reviewed by Rob Buis.
Internally reviewed by Jakob Petsovits.

Internal PR276660
Have BackingStore::createBackingStoreMemory & releaseBackingStoreMemory only
acquire & release the surface pool. It doesn't matter if either is called
redundantly since SurfacePool has internal state to protect against that.

Resuming & suspending backing store and screen updates will be handled by
the WebPageClient.

* Api/BackingStore.cpp:
(BlackBerry::WebKit::BackingStore::acquireBackingStoreMemory):
(BlackBerry::WebKit::BackingStore::releaseOwnedBackingStoreMemory):
* Api/BackingStore.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140191 268f45cc-cd09-0410-ab3c-d52691b4dbfc