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With this CL, we can inject sysroot precisely.

BUG=1043804
TEST=Built locally.

Change-Id: I459a45eca86f96c4b143b055b588cd50e24f283a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057503
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741566}