Assume CrRenderer thread to be the one with the most events

[christian-bromann]

Problem

While testing this library we found that Chrome sometimes misses to capture all meta correctly. In ~10% of trace logs captured from Alexas 500 top used pages there following trace event is missing:

{"pid":99225,"tid":775,"ts":0,"ph":"M","cat":"__metadata","name":"thread_name","args":{"name":"CrRendererMain"}}

Which causes an error when trying to calculate a bunch of metrics.

Solution

As a workaround let's assume that the main thread is the one with the most events connected to it.

[farhan-sauce]

LGTM