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This CL supports also_build_ash_chrome arg to allow building ash-chrome
in an alternate toolchain.

A few other fixes are required to work, but they will be landed in
separate CLs because they could affect existing builds, so landing them
separately will make it easier to reason and detect potential breakages.

Bug: 1129223
Change-Id: I94dc3dc1ca2bc96f029fea3c4f4d6e41d018e2ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416999
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#808611}