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The IPCs to create/destroy the Render* objects were already moved to
AgentSchedulingGroup, but until now it delegated the implementation to
RenderThreadImpl. This CL moves the actual implementation to
AgentSchedulingGroup.

Bug: 1111231
Change-Id: I5ade91a18c72882781eba159b9708aea7f857945
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485659
Commit-Queue: Tal Pressman <talp@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Dominic Farolino <dom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819716}