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This pulls out some changes from http://crrev.com/c/1783727 that are
needed to make the WebLayer lib work when used with monochrome.

Change-Id: Ia749d0b9c7efdfd5906a684346cce30ad9b2c7b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1788236Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694369}