Enable Heap Profiling Service in Chromecast

Hook up heap_profiling::Supervisor in browser process in cast_shell
so that it can access the heap profiling process.

Bug=Internal b/110433621

Change-Id: I59fdad131108955a8a87f3ba2050664c5f294941
Reviewed-on: https://chromium-review.googlesource.com/c/1282042
Commit-Queue: Chia-hung Duan <chiahungduan@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#617038}
16 files changed