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Resources are only explicitly returned from OnDraw. This means it's
possible for resources to be stuck in RenderThreadManager
returned_resources_map_ indefinitely, if OnDraw stops.

Post a task with roughly 2 frames of delay to return these resources to
ensure that they don't get stuck indefinitely.

Bug: 881957
Change-Id: I2a6331b9251b4057125761eb9fb0aaf29c881eeb
Reviewed-on: https://chromium-review.googlesource.com/1214700Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590501}