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This is to only instrument CL affected files for iOS coverage try
builder for efficiency.

Bug: 1090188
Change-Id: I386dcafef9ee174a7b22cbc0073ee58118f4ed6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2227305Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774432}