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There was a race condition that could cause the vm region map in a memlog trace
to contain full file paths. This happened if the CoordinatorImpl callback occurred before the
TracingController was able to set the TracingConfig on TraceLog.

Change-Id: If3b424ed13b91a0bd644316fe1a7b30a6254b191
Reviewed-on: https://chromium-review.googlesource.com/1072312Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562551}