Jamie Gennis f9c7d6bc15 Add APIs for application-generated systrace events
This change adds new APIs to enable applications to generate custom Systrace
begin/end events.  Application-generated events use the ATRACE_APP_TAG tag,
which is enabled only if either the application has declared itself debuggable
in its manifest or ro.debuggable is set to 1 on the device.

Change-Id: I311d09e2e6ed1a30f5ffa84907f250e11cc0d48d
2013-04-09 11:59:43 -07:00
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