Windows: acknowledge AcceleratedSurfaceBuffersSwapped even if surface ID is zero.
Windows: acknowledge AcceleratedSurfaceBuffersSwapped even if surface ID is zero.

This is used even when image transport surfaces are disabled for synchronization purposes and surface ID is zero in that case.

Review URL: http://codereview.chromium.org/9704065

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@127087 0039d316-1c4b-4281-b951-d872f2087c98

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