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Older versions of Chrome expanded thumbnails to 1024x1024 to work around
an IMG driver bug.  When these were processed through DecompressionTask,
they got corrupted because this method assumed the content size and
buffer size were the same.  This patch changes it to decompress into a
potentially larger buffer then copy if needed.

BUG=416437

Review URL: https://codereview.chromium.org/598593003

Cr-Commit-Position: refs/heads/master@{#296341}