[Android] better systrace support and JS trace markers for android.

[jayshah123]

Checking as of
RN0.28 on Android with systrace and all markers enabled including application markers..,
React native Android JS level markers are not nearly as useful as the ones present in IOS.
More details at StackOverflow

[lacker]

This now seems like a dupe of that Stack Overflow link so I'm going to close this issue.

[laalaguer]

any progress on this issue? I am looking at the same graph on my trancing env, also.