Add TODO(name) to comply with Clang Tidy. (#46057)

Partial work towards flutter/flutter#134969.

Author: matanlurey

shell/platform/darwin/macos/framework/Headers/FlutterEngine.h

@@ -16,7 +16,7 @@
 #import "FlutterPluginRegistrarMacOS.h"
 #import "FlutterTexture.h"
 
-// TODO: Merge this file with the iOS FlutterEngine.h.
+// TODO(stuartmorgan): Merge this file with the iOS FlutterEngine.h.
 
 @class FlutterViewController;
 

shell/platform/darwin/macos/framework/Headers/FlutterPluginRegistrarMacOS.h

@@ -11,8 +11,8 @@
 #import "FlutterPluginMacOS.h"
 #import "FlutterTexture.h"
 
-// TODO: Merge this file and FlutterPluginMacOS.h with the iOS FlutterPlugin.h, sharing all but
-// the platform-specific methods.
+// TODO(stuartmorgan): Merge this file and FlutterPluginMacOS.h with the iOS FlutterPlugin.h,
+// sharing all but the platform-specific methods.
 
 /**
  * The protocol for an object managing registration for a plugin. It provides access to application