Move more extension action cocoa logic into the platform delegate

chrome/browser/ui/cocoa/extensions/extension_action_platform_delegate_cocoa.h

Index: chrome/browser/ui/cocoa/extensions/extension_action_platform_delegate_cocoa.h
diff --git a/chrome/browser/ui/cocoa/extensions/extension_action_platform_delegate_cocoa.h b/chrome/browser/ui/cocoa/extensions/extension_action_platform_delegate_cocoa.h
index ce2d153cacc94b83d219a502d73f7a921b2d546f..2913647da68f5f44b74e031010539e65fe9ec23f 100644
--- a/chrome/browser/ui/cocoa/extensions/extension_action_platform_delegate_cocoa.h
+++ b/chrome/browser/ui/cocoa/extensions/extension_action_platform_delegate_cocoa.h
@@ -5,14 +5,19 @@
 #ifndef CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_ACTION_PLATFORM_DELEGATE_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_ACTION_PLATFORM_DELEGATE_COCOA_H_
 
+#include "base/mac/scoped_nsobject.h"
 #include "chrome/browser/ui/extensions/extension_action_platform_delegate.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 
+@class ExtensionActionContextMenuController;
 @class ExtensionPopupController;
 class ToolbarActionViewDelegateCocoa;
 
 // The cocoa-specific implementation for ExtensionActionPlatformDelegate.
 class ExtensionActionPlatformDelegateCocoa
-    : public ExtensionActionPlatformDelegate {
+    : public ExtensionActionPlatformDelegate,
+      public content::NotificationObserver {
  public:
   ExtensionActionPlatformDelegateCocoa(
       ExtensionActionViewController* controller);
@@ -32,14 +37,25 @@ class ExtensionActionPlatformDelegateCocoa
       const GURL& popup_url,
       bool grant_tab_permissions) override;
 
+  // content::NotificationObserver:
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
   // Returns the popup shown by this extension action, if one exists.
   ExtensionPopupController* GetPopup() const;
 
   // Returns the delegate in its cocoa implementation.
   ToolbarActionViewDelegateCocoa* GetDelegateCocoa();
 
+  // The main controller for this extension action.
   ExtensionActionViewController* controller_;
 
+  // The context menu controller for the extension action, if any.
+  base::scoped_nsobject<ExtensionActionContextMenuController> menuController_;
+
+  content::NotificationRegistrar registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionActionPlatformDelegateCocoa);
 };