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This CL uses clang coverage instrumentation on linux-rel and turns it
off on linux-coverage-rel.

Bug: 930364
Change-Id: I1a251a70ede8e4cc9567cbbcab715e0cc5cd2fb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1709091Reviewed-by: Aaron Gable <agable@chromium.org>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680532}