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This CL is a refactor with no intended behavior change outside of tests.

Test behavior change:
* TestDriver::CheckOrStartProfiling now waits for the allocator shim to be
  initialized even if profiling was enabled for the current process via command
  line flags. This is because initialization is asynchronous.
* TestDriver::ValidateRendererAllocations no longer makes any checks if the
  renderer is not being profiled, since on Android WebView there may not even be
  a renderer process in this case.

Refactor:
* Moves the C++ side of the android test shim into components/heap_profiling, so
  that the logic can be shared with Android Webview.
* Renames the test shim from TestAndroidShim to HeapProfilingTestShim.
* Removes redundant checks in TestDriver::ValidateRendererAllocations.

Change-Id: I4755f6169b0f9c556a86005916aa9150dec6853b
BUG: 827545
Reviewed-on: https://chromium-review.googlesource.com/1012542Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551242}