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These bitmaps are safer for transport from untrustworthy sources since
all bitmaps should be in N32 format and the browser can make bad
assumptions as a result.

Bug: 1144462
Change-Id: I9c4fde80a4124753c11845cbcc202cce2c3d31a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2582928Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835684}