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This CL is adding a trace event to observe the side-effects of fonts
enumeration in content.

This API is used font_settings_api.
See: chrome/browser/extensions/api/font_settings/font_settings_api.cc

Bug: 944227
Change-Id: Id6af649c3abc2f6806abf9d11a5df17e91ce915c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1604313Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659194}