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As part of MBI, most widget/view/frame-related messages will go through
the AgentSchedulingGroup instead of RenderProcess/RenderThread. That can
change the ordering in which messages are handled, and may break some
assumptions we are currently making. In order to enable testing and
experimentation with this ordering change, this CL makes the ASG
interfaces channel-associated, thus preserving the current message order.
This will allow us to migrate all the currently channel-associated
interfaces to be associated with the ASG, and control the ordering via a
flag.

Bug: 1111231
Change-Id: Id04d90c748a2ce2cbb47d1cde7892fa99b1aac70
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386859
Commit-Queue: Tal Pressman <talp@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Dominic Farolino <dom@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806525}