react-native/React/React.xcodeproj
Tadeu Zagallo 080d3b9f62 [ReactNative] Add PerformanceLogger to measure TTI
Summary:
@public

Add PerformanceLogger to keep track of JS download, initial script execution and
full TTI.

Test Plan:
The Native side currently calls `addTimespans` when it's finish initializing
with the six values (start and end for the three events), so I just checked it
with a `PerformanceLogger.logTimespans()` at the end of the function.

```
2015-06-18 16:47:19.096 [info][tid:com.facebook.React.JavaScript] "ScriptDownload: 48ms"
2015-06-18 16:47:19.096 [info][tid:com.facebook.React.JavaScript] "ScriptExecution: 106ms"
2015-06-18 16:47:19.096 [info][tid:com.facebook.React.JavaScript] "TTI: 293ms"
```
2015-06-19 15:01:35 -08:00
..
project.pbxproj [ReactNative] Add PerformanceLogger to measure TTI 2015-06-19 15:01:35 -08:00