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Currently, the work queue of a test is managed in a TestRunner,
i.e. a render thread.
But if we swap RenderFrameHost with pro-active same-site BI swap or
Back-Forward cache, the TestRunner that controls the test can
migrate processes and can lose some information.

This CL migrates the work queue to WebTestControlHost, i.e. the
browser process, and makes the TestRunner that refers the main window
work together.


Bug: 1136383, 1132180
Change-Id: Ie95fd4c694be120b9611e4ac156fc6417bb96d87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469351
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Auto-Submit: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822067}