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Currently, EventLatency metrics only measure total latency from event
timestamp up to frame presentation (and for scroll events, from event
timestamp up to gpu-swap-end). This CL adds top-level compositor
breakdowns. Further breakdowns for blink and viz stages will be added in
follow-up CLs.

Bug: 1054009
Change-Id: I65341dbc10d08b8acbd05185cf270b0a1fc4d842
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132853Reviewed-by: Jonathan Ross <jonross@chromium.org>
Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Mohsen Izadi <mohsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756280}