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* The test should observe the active window (that will be dragged)
  instead of all.
* PresentationTimeRecorder used to discard the presentation feedback
  that can happen after it is deleted. This CL introduces the internal
  state that can outlive until the feedback is recorded.
* I also removed the max latency as it's very noisy and normal latency
  should be enough. (SplitView test does the same)

Bug: 953355
Change-Id: I3b3e329ca4e866004763f18c55f71816d5a5d535
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1572268
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652282}