Clients are free to ignore gpu memory allocations, so always send allocations even if they were already sent.
Clients are free to ignore gpu memory allocations, so always send allocations even if they were already sent.

Soon, the WK compositor will start ignoring suggestHaveBackbuffer requests under certain circumstances.
Since the GpuMemoryManager can track when this happens, and retry with another identical allocation, GpuCommandBufferStub should always send allocations as they are assigned.

BUG=120190
TEST=Manual


Review URL: http://codereview.chromium.org/9854034

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@129031 0039d316-1c4b-4281-b951-d872f2087c98

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