Przemysław Pietrzkiewicz ef589f99bc Plumb dart timeline events to mojo:tracing. (#2595)
This patch:

 - makes dart traces (coming from the VM and the timeline API)
   available to mojo:tracing
 - adds --vm-complete-timeline parameter, which makes the Dart VM enable all
   categories of timeline traces from the beginning, allowing to do startup
   tracing

This is based on the equivalent support in dart content handler.

Fixes https://github.com/flutter/flutter/issues/3162.
2016-05-10 11:08:36 -07:00
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