Move batchedbridge start out of init

Reviewed By: javache

Differential Revision: D3913304

fbshipit-source-id: 7d9b5b352d95dd770757cc99dddcce510cdd4909

React/Base/RCTBatchedBridge.m

@@ -80,12 +80,6 @@ typedef NS_ENUM(NSUInteger, RCTBridgeFields) {
     _displayLink = [RCTDisplayLink new];
 
     [RCTBridge setCurrentBridge:self];
-
-    [[NSNotificationCenter defaultCenter]
-     postNotificationName:RCTJavaScriptWillStartLoadingNotification
-     object:_parentBridge userInfo:@{@"bridge": self}];
-
-    [self start];
   }
   return self;
 }
@@ -97,6 +91,10 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithDelegate:(id<RCTBridgeDelegate>)dele
 
 - (void)start
 {
+  [[NSNotificationCenter defaultCenter]
+    postNotificationName:RCTJavaScriptWillStartLoadingNotification
+    object:_parentBridge userInfo:@{@"bridge": self}];
+
   RCT_PROFILE_BEGIN_EVENT(0, @"-[RCTBatchedBridge setUp]", nil);
 
   dispatch_queue_t bridgeQueue = dispatch_queue_create("com.facebook.react.RCTBridgeQueue", DISPATCH_QUEUE_CONCURRENT);

React/Base/RCTBridge+Private.h

@@ -80,6 +80,11 @@ RCT_EXTERN void RCTVerifyAllModulesExported(NSArray *extraModules);
  */
 @property (nonatomic, assign, readonly) BOOL moduleSetupComplete;
 
+/**
+ * Called on the child bridge to run the executor and start loading.
+ */
+- (void)start;
+
 /**
  * Used by RCTModuleData to register the module for frame updates after it is
  * lazily initialized.
@@ -142,5 +147,6 @@ RCT_EXTERN void RCTVerifyAllModulesExported(NSArray *extraModules);
 @property (nonatomic, assign, readonly) BOOL moduleSetupComplete;
 
 - (instancetype)initWithParentBridge:(RCTBridge *)bridge NS_DESIGNATED_INITIALIZER;
+- (void)start;
 
 @end

React/Base/RCTBridge.m

@@ -296,6 +296,7 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
   _bundleURL = [RCTConvert NSURL:_bundleURL.absoluteString];
 
   [self createBatchedBridge];
+  [self.batchedBridge start];
 
   RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"");
 }