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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: Idf24a0cbb84fa884b67aa217e2ecc2cc0885d0a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575152
Auto-Submit: danakj <danakj@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833957}