Replace TraceEvent.begin()/end() with explicit names
Replace TraceEvent.begin()/end() calls which implicitly gets the trace event name by doing a costly stack dump, with explicitly named trace event names. Also wrap traces around try/finally. BUG=439118 Review URL: https://codereview.chromium.org/795053007 Cr-Commit-Position: refs/heads/master@{#307974}
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