Add heuristic for fixing the alpha channel when reading clipboard images on Windows
Add heuristic for fixing the alpha channel when reading clipboard images on Windows

The code attempts to detect an image with a garbage in the alpha channel and reset the alpha channel to a sane state in that case.

BUG=97160
TEST=Paste an image into a page using event.ClipboardData with the Windows Basic theme active.

Review URL: http://codereview.chromium.org/7967007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@102317 0039d316-1c4b-4281-b951-d872f2087c98

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