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If the client stops requesting begin-frames, then it is unlikely to
submit any compositor-frames for any begin-frame it may still be
handling. So terminate the associated reporters in this case.

BUG=790761

Change-Id: I2db257af67ea1827b97703280c12ab202b9be89e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2146785Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Auto-Submit: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758909}