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This avoids buffer-size mistakes when reading the pixel data. We will
CHECK() on the sender side if the InlineBitmap creator violates this
requirement when converting from an SkBitmap, and we will reject the
message on the receiving side if the number of bytes does not match
exactly w*h*4.

Adds tests for the InlineBitmap expectations, and remove the unit test
and verification code in the extensions host side, as the wire format
can no longer be invalid and require conversion.

Bug: 1144462
Change-Id: Ie90b91513f40a58294ffd4d84dac88624b6082b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2546967Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829342}