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This moves the implementation of RendererResourceCoordinator to
controller, leaving behind only the interface definition and singleton
accessor in platform.

Change-Id: Ibdf23280e53b48df897ec341d27fe366efb04f5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354534
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Joe Mason <joenotcharles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797865}