ehmaldonado a973265622 Make it possible for tests to set up trace event handlers.
As it is now, the first time a TRACE_EVENT... is called, the result from
the current handler is stored in a static const variable, and subsequent
calls will use that value regardless of changes to the handler.

This is a problem if a test wants to use another handler.

BUG=None

Review-Url: https://codereview.webrtc.org/3002663002
Cr-Commit-Position: refs/heads/master@{#19382}
2017-08-17 13:02:20 +00:00
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