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This CL supports user provided ash-chrome to make it easy to test
crosapi tests that depend on changes made in ash-chrome side.

Bug: 1129223
Change-Id: I1be43c760222ed25f0423e7ca05c5e6965441ae0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415220
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808633}