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This change adds trace entries under content::Start.
Also moves the call to TraceEvent.setATraceEnabled to the very beginning
of startChromiumLocked().

Bug: 1019793
Change-Id: I06d3a9d4cb20075f2dc2ce999ffe5efe3d1dd0bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1962858Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726458}