Start/stop Profiler instrumentation from enable/disable command handlers
Start/stop Profiler instrumentation from enable/disable command handlers

BUG=248092
R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/16896008

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@152414 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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