GitLab

Added a new trace event phase 'M'/TRACE_EVENT_PHASE_METADATA,
which can become a general mechanism for adding metadata to traces.

The two M-type events that we then add are:
	{ph=M pid=<pid> name="process_name" args={ name="name of pid" }}
	{ph=M pid=<pid> tid=<tid> name="thread_name" args={ name="name of tid" }}

base::thread is instrumented to set names automatically. I will do a followon
changelist to add instrumentation to Chrome for its various processes and
threads.

Review URL: http://codereview.chromium.org/7495031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95997 0039d316-1c4b-4281-b951-d872f2087c98