bundledSourceURLForBridge always return bundle path

Differential Revision: D6215467

fbshipit-source-id: 49d818cfdb776dd849a809440a1e592e5cb2231a

Author: Yujie Liu

React/Base/RCTBridgeDelegate.h

@@ -43,8 +43,6 @@
 /**
  * The location of bundle path, this should be a `file://` url
  * pointing to a path inside the bundle resources, e.g. `file://..//main.jsbundle`.
- * When running from the packager this should be an absolute URL,
- * e.g. `http://localhost:8081/index.ios.bundle`.
  */
 - (NSURL *)bundledSourceURLForBridge:(RCTBridge *)bridge;
 

React/Base/RCTBundleURLProvider.h

@@ -42,6 +42,14 @@ extern const NSUInteger kRCTBundleURLProviderDefaultPort;
 - (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
                    fallbackResource:(NSString *)resourceName;
 
+/**
+ * Returns the jsBundleURL for a given bundle entrypoint and
+ * the fallback offline JS bundle. If resourceName or extension
+ * are nil, "main" and "jsbundle" will be used, respectively.
+ */
+- (NSURL *)jsBundleURLForFallbackResource:(NSString *)resourceName
+                        fallbackExtension:(NSString *)extension;
+
 /**
  * Returns the resourceURL for a given bundle entrypoint and
  * the fallback offline resource file if the packager is not running.

React/Base/RCTBundleURLProvider.m

@@ -121,9 +121,7 @@ - (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot fallbackResource:(NSS
 {
   NSString *packagerServerHost = [self packagerServerHost];
   if (!packagerServerHost) {
-    resourceName = resourceName ?: @"main";
-    extension = extension ?: @"jsbundle";
-    return [[NSBundle mainBundle] URLForResource:resourceName withExtension:extension];
+    return [self jsBundleURLForFallbackResource:resourceName fallbackExtension:extension];
   } else {
     return [RCTBundleURLProvider jsBundleURLForBundleRoot:bundleRoot
                                              packagerHost:packagerServerHost
@@ -137,6 +135,14 @@ - (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot fallbackResource:(NSS
   return [self jsBundleURLForBundleRoot:bundleRoot fallbackResource:resourceName fallbackExtension:nil];
 }
 
+- (NSURL *)jsBundleURLForFallbackResource:(NSString *)resourceName
+                        fallbackExtension:(NSString *)extension
+{
+  resourceName = resourceName ?: @"main";
+  extension = extension ?: @"jsbundle";
+  return [[NSBundle mainBundle] URLForResource:resourceName withExtension:extension];
+}
+
 - (NSURL *)resourceURLForResourceRoot:(NSString *)root
                          resourceName:(NSString *)name
                     resourceExtension:(NSString *)extension