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This CL is a refactor and has no intended behavior change.

This CL:
  * Creates a new class Supervisor in components/heap_profiling. This class
    presents a single interface for tests and consumers of the Heap Profiling
    Service.
  * Moves end to end test logic into components/heap_profiling.
  * Leaves the emit metrics, save to file, and upload in background logic in
    ProfilingProcessHost.

This refactor is necessary in order to expose this shared logic [previously
located in chrome/] to Android WebView.

The changes in this CL are tested by the end to end tests in
ProfilingTestDriver.

Change-Id: I3fda597b210522404203ac9cf932f7bccd76cad7
Bug: 827545
Reviewed-on: https://chromium-review.googlesource.com/1008366
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551055}