Fix LazilyLoadView lookup so that it can drop RCT prefixes.

Summary:
While debugging internally, we have found that modules are almost always registered
with their "RK" or "RCT" prefixes dropped.

However, if a view is named `RCTFooView` and needs `RCTFooViewManager` to render natively, it will almost never find it because `RCT` was dropped from the key to the ViewManager instance.

In the event you look for a `ViewManager` and don't find it, this strips any "React" prefixes from your key and tries ones more time.

Reviewed By: spredolac

Differential Revision: D10734005

fbshipit-source-id: 2bfa6f19830f14f09af2fe7dc7e44b7e26e0ac3f

Author: d16r

React/Base/RCTBridge.m

@@ -82,13 +82,7 @@ void RCTRegisterModule(Class moduleClass)
     name = NSStringFromClass(cls);
   }
 
-  if ([name hasPrefix:@"RK"]) {
-    name = [name substringFromIndex:2];
-  } else if ([name hasPrefix:@"RCT"]) {
-    name = [name substringFromIndex:3];
-  }
-
-  return name;
+  return RCTDropReactPrefixes(name);
 }
 
 static BOOL jsiNativeModuleEnabled = NO;

React/Base/RCTUtils.h

@@ -146,4 +146,7 @@ RCT_EXTERN NSString *RCTUIKitLocalizedString(NSString *string);
 RCT_EXTERN NSString *__nullable RCTGetURLQueryParam(NSURL *__nullable URL, NSString *param);
 RCT_EXTERN NSURL *__nullable RCTURLByReplacingQueryParam(NSURL *__nullable URL, NSString *param, NSString *__nullable value);
 
+// Given a string, drop common RN prefixes (RCT, RK, etc.)
+RCT_EXTERN NSString *RCTDropReactPrefixes(NSString *s);
+
 NS_ASSUME_NONNULL_END

React/Base/RCTUtils.m

@@ -900,3 +900,14 @@ static void RCTGetRGBAColorComponents(CGColorRef color, CGFloat rgba[4])
   components.queryItems = queryItems;
   return components.URL;
 }
+
+RCT_EXTERN NSString *RCTDropReactPrefixes(NSString *s)
+{
+  if ([s hasPrefix:@"RK"]) {
+    return [s substringFromIndex:2];
+  } else if ([s hasPrefix:@"RCT"]) {
+    return [s substringFromIndex:3];
+  }
+
+  return s;
+}

React/Modules/RCTUIManager.m

@@ -1572,6 +1572,14 @@ static void RCTMeasureLayout(RCTShadowView *view,
   }
 
   id module = [self.bridge moduleForName:moduleName];
+  if (module == nil) {
+    // There is all sorts of code in this codebase that drops prefixes.
+    //
+    // If we didn't find a module, it's possible because it's stored under a key
+    // which had RCT Prefixes stripped. Lets check one more time...
+    module = [self.bridge moduleForName:RCTDropReactPrefixes(moduleName)];
+  }
+
   RCTComponentData *componentData = [[RCTComponentData alloc] initWithManagerClass:[module class] bridge:self.bridge];
   _componentDataByName[componentData.name] = componentData;
   NSMutableDictionary *directEvents = [NSMutableDictionary new];