testing

testing


[tracing] Add background memory tracing browser test

This CL adds a browser test for background mode memory tracing.
To start tracing in background mode, trace config string must be passed
with background mode trigger. So, this CL edits the tracing test to
support trace config strings.
Discardable dump provider creates dumps with same name from browser and
renderer and this is not allowed in single process mode. So, child ids
are added to the dumps.

BUG=613198

[ssid, 2016-06-10 23:41:18]

Patchset #1 (id:1) has been deleted