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RequestNewThroughputTracker creates a ThroughputTracker to track
throughput of ui::Compositor. Each ThroughputTracker is assigned
a per-compositor unique sequence id. The sequence id will be used
on impl side to create a kCustom typed cc::FrameSequenceTracker.

When a tracker is started, stopped or canceled, an entry is created
in AnimationHost to store the pending start/stop info of the id.
This info is pushed to impl side along with other properties.

Bug: 1021774
Change-Id: I8cf8b4051bc68054c199d510083abf7bd41cf6e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2008001Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757853}