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This CL generates per directory code coverage breakdown.

Bug: 789692
Change-Id: I318e2b03c255069b9ecf6d10ca276264491b7d76
Reviewed-on: https://chromium-review.googlesource.com/814598
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Abhishek Arya <inferno@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527350}