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Add %c to raw profile filename pattern so coverage data won't lost at
program crash. See:
https://clang.llvm.org/docs/SourceBasedCodeCoverage.html#running-the-instrumented-program

Bug: 1090188
Change-Id: I4eab6137a385701186f2c330ce4be35e2694b229
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2472920Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817265}