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Now ChildThreadImpl needs to pass an IPC listener task runner to create
IPC::SyncChannel, but ChildThreadImpl can't refer schedulers. This CL
enables ChildThreadImpl to refer ChildScheduler by adding ChildScheduler
::IPCListenerTaskRunner function. Now the implementation
(RendererScheduler::IPCListenerTaskRunner) just returns base::
ThreadTaskRunnerHandle::Get().

This CL is just a preparation for flexible scheduling, and doesn't
change any behavior so far.

Bug: 780785
Change-Id: I46965cab95ca6f98dee56299df9ebea1462886d8
Reviewed-on: https://chromium-review.googlesource.com/760336Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515913}