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The mojom category is needed to debug what is happening on the IO/Thread.
We are seeing janks related to communications between renderers, browser
and GPU. We believe the mojom categoy will help us doing investigation.

R=oysteine@chromium.org

Bug: 867931
Change-Id: Ic01d67ca82cf60e949793eaf5ac1a09486452519
Reviewed-on: https://chromium-review.googlesource.com/c/1437065Reviewed-by: oysteine <oysteine@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626174}