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This CL adds the Global Media Controls IPH triggering logic and
connects it with the frontend IPH bubble.

Bug: 991585
Change-Id: I3c7b1e824ede5b620a87fa92306f6c9bdac1e348
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783667Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Collin Baker <collinbaker@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694272}