Rename BridgeProfiling to Systrace for consistency

Summary:
public

Rename the `BridgeProfiling` JS module to `Systrace`, since it's actually just
an API to Systrace markers.

This should make it clearer as we add more perf tooling.

Reviewed By: jspahrsummers

Differential Revision: D2734001

fb-gh-sync-id: 642848fa7340c545067f2a7cf5cef8af1c8a69a2

Libraries/JavaScriptAppEngine/Initialization/InitializeJavaScriptAppEngine.js

@@ -165,8 +165,8 @@ function setUpWebSockets() {
 
 function setUpProfile() {
   if (__DEV__) {
-    var BridgeProfiling = require('BridgeProfiling');
-    BridgeProfiling.swizzleReactPerf();
+    var Systrace = require('Systrace');
+    Systrace.swizzleReactPerf();
   }
 }
 

Libraries/JavaScriptAppEngine/System/JSTimers/JSTimersExecution.js

@@ -14,7 +14,7 @@ var invariant = require('invariant');
 var keyMirror = require('keyMirror');
 var performanceNow = require('performanceNow');
 var warning = require('warning');
-var BridgeProfiling = require('BridgeProfiling');
+var Systrace = require('Systrace');
 
 /**
  * JS implementation of timer functions. Must be completely driven by an
@@ -113,7 +113,7 @@ var JSTimersExecution = {
    * more immediates are queued up (can be used as a condition a while loop).
    */
   callImmediatesPass: function() {
-    BridgeProfiling.profile('JSTimersExecution.callImmediatesPass()');
+    Systrace.beginEvent('JSTimersExecution.callImmediatesPass()');
 
     // The main reason to extract a single pass is so that we can track
     // in the system trace
@@ -128,7 +128,7 @@ var JSTimersExecution = {
       }
     }
 
-    BridgeProfiling.profileEnd();
+    Systrace.endEvent();
 
     return JSTimersExecution.immediates.length > 0;
   },