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This CL adds a new method of the profiling_service mojom interface which
asynchronously returns the list of profiled processes. This is used in two places:
  * By the chrome://memory-internals to determine whether a process is being
  profiled. This also allows chrome://memory-internals to expose a "start
  profiling" button for non-profiled processes.
  * By the background profiling triggers, since traces should only be triggered
  if a profiled process exceeds the thresholds.

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I44da48eb1203b82f9cef8907fc7c2ab0fdcfdfce
Reviewed-on: https://chromium-review.googlesource.com/809505
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522037}