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This adds compositor trace events to the BENCHMARK_RENDERERS slow reports,
which is needed to analyze certain events related to frame timing.

Change-Id: Iae65efa506b20a7cdee088c6c379d4e3b049b676
Reviewed-on: https://chromium-review.googlesource.com/c/1446507
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629168}