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Although extensions now uses mojo to receive SkBitmaps, even those still
have a variety of color types. And some of those colortypes use other
pixel sizes than 32bpp, which can lead to buffer overflow bugs. So we
convert any incoming arbitrary bitmaps received from (extensions)
renderer processes to be N32 upon receipt.

R=reillyg@chromium.org

Bug: 1144462
Change-Id: I66acc7fbfcc0565411a1b9b9bc5a01b70558c5b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532663Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826425}