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This CL is adding a renderers specific tracing scenario.

The previous tracing scenario was BENCHMARK_IPC which is not given
enough details to make renderers traces actionnale. We are making a
specific scenario and will add the required category to debug
renderers issues.

R=gab@chromium.org, oysteine@chromium.org

Change-Id: I8e0dbce3f18a403de6f0f7bb4c63abf4a1b53f66
Reviewed-on: https://chromium-review.googlesource.com/c/1286770
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600773}