TM iOS: autogenerate plugins map based on FB build system

Summary: This adds internal script to automatically sync the plugins definition. For github consumption, the CoreModulesPlugins.* will stay checked in, nothing change.

Reviewed By: RSNara

Differential Revision: D16102352

fbshipit-source-id: 8f74ea9dde046183ae620682fd7e181b4cc95a94

Author: fkgozali

React/CoreModules/CoreModulesPlugins.h

@@ -3,6 +3,8 @@
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
+ *
+ * @generated by an internal plugin build system
  */
 
 #ifdef RN_DISABLE_OSS_PLUGIN_HEADER
@@ -12,7 +14,7 @@
 
 #else
 
-// OSS-compatibility layer: manually define these for github.
+// OSS-compatibility layer
 
 #import <Foundation/Foundation.h>
 
@@ -26,8 +28,7 @@ extern "C" {
 // RCTTurboModuleManagerDelegate should call this to resolve module classes.
 Class RCTCoreModulesClassProvider(const char *name);
 
-// NOTE: Sync these with FB internal version.
-
+// Lookup functions
 Class RCTPlatformCls(void);
 
 #ifdef __cplusplus

React/CoreModules/CoreModulesPlugins.mm

@@ -3,20 +3,20 @@
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
+ *
+ * @generated by an internal plugin build system
  */
 
 #ifndef RN_DISABLE_OSS_PLUGIN_HEADER
 
-// OSS-compatibility layer: manually define these for github.
-// TODO: This should be codegen'ed
+// OSS-compatibility layer
 
 #import "CoreModulesPlugins.h"
 
 #import <string>
 #import <unordered_map>
 
 static std::unordered_map<std::string, Class (*)(void)> sCoreModuleClassMap = {
-  // NOTE: Sync these with FB internal plugin definitions.
   {"PlatformConstants", RCTPlatformCls},
 };