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[ReactNative] Add PerformanceLogger to measure TTI

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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"
```
This commit is contained in:
Tadeu Zagallo
2015-06-19 14:59:42 -07:00
parent 4d97c01f4b
commit 080d3b9f62
8 changed files with 214 additions and 0 deletions
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1
Libraries/JavaScriptAppEngine/Initialization/InitializeJavaScriptAppEngine.js
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@@ -24,6 +24,7 @@
// Just to make sure the JS gets packaged up.
require('RCTDeviceEventEmitter');
require('PerformanceLogger');
if (typeof GLOBAL === 'undefined') {
GLOBAL = this;