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This change has the following advantages: - We now keep track of the amount of time spent doing unknown activities using its own timer. - Several pieces of analysis server functionality are now tracked (previously we only tracked time spent inside the "analyzer" package). - The set of all performance timers is tracked in PerformanceTag.all so that new timers can be added without having to update the code that prints out timing measurements. - Performance measurement code has been integrated with Observatory "user tags", so that the same categories measured by the analysis server also show up in the VM profiler view. R=brianwilkerson@google.com Review URL: https://codereview.chromium.org//918383002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43745 260f80e4-7a28-3924-810f-c04153c831b5