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We are seeing OOM crashes from FrameSequenceTracker, and suspect that
a tracker may never be terminated.

This CL adds some debugging instrumentation to investigate what
happens after a tracker is scheduled to terminate.

Bug: 1072482
Change-Id: Ifb96ba4e00a014cdd3d7cd83c453f6f799737ef4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2169761
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763545}