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. Remove a TODO about renaming that does not need to happen anymore.
. Use the sequence-number of a BeginFrameArgs in some traces, rather
  than having a separate identifier. This makes it easier to follow the
  traces, since various other trace-events also use the same sequence
  number from BeginFrameArgs.

BUG=none

Change-Id: Ifb2c8e0f480b884485dbfb8f1af7106200fbd0cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392401
Auto-Submit: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805509}