Adam Barth 55f5a4c536 Add more tracing to Sky
This CL adds trace events:

1) Between requesting a frame and begin frame.
2) In the DartLoader see network latency.
3) While executing |main| and |_init|.

TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1025073003
2015-03-20 16:11:39 -07:00
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