GitLab

Adds unit tests which verify propagation of messages and channel
events through FIDL/Blink and Blink/FIDL adapter layers.

Fixes a FIDL flow control bug and adds a regression test for it.

Add test main.cc for tests which depend on an active Mojo instance.

Bug: 1117518
Bug: 1126571
Change-Id: Ied814298b82f9e5eef1e99b158b45bfdd9d1fd8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422476Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Sharon Yang <yangsharon@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810858}