Sad Tab view for the Mac.

chrome/browser/tab_contents/web_contents_view_mac.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_TAB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_
 #define CHROME_BROWSER_TAB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/gfx/size.h"
 #include "base/scoped_cftyperef.h"
 #include "chrome/browser/tab_contents/web_contents_view.h"
+#include "chrome/common/notification_registrar.h"
 
 class FindBarMac;
+@class SadTabView;
 
 @interface WebContentsViewCocoa : NSView {
 }
 
 @end
 
 // Mac-specific implementation of the WebContentsView. It owns an NSView that
 // contains all of the contents of the tab and associated child views.
-class WebContentsViewMac : public WebContentsView {
+class WebContentsViewMac : public WebContentsView,
+                           public NotificationObserver {
  public:
   // The corresponding WebContents is passed in the constructor, and manages our
   // lifetime. This doesn't need to be the case, but is this way currently
   // because that's what was easiest when they were split.
   explicit WebContentsViewMac(WebContents* web_contents);
   virtual ~WebContentsViewMac();
 
   // WebContentsView implementation --------------------------------------------
 
   virtual WebContents* GetWebContents();
@@ skipping 29 matching lines @@
   virtual void StartDragging(const WebDropData& drop_data);
   virtual void UpdateDragCursor(bool is_drop_target);
   virtual void TakeFocus(bool reverse);
   virtual void HandleKeyboardEvent(const WebKeyboardEvent& event);
   virtual void OnFindReply(int request_id,
                            int number_of_matches,
                            const gfx::Rect& selection_rect,
                            int active_match_ordinal,
                            bool final_update);
 
+  // NotificationObserver implementation ---------------------------------------
+
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
  private:
   // ---------------------------------------------------------------------------
 
   WebContents* web_contents_;
 
   // The Cocoa NSView that lives in the view hierarchy.
   scoped_cftyperef<WebContentsViewCocoa*> cocoa_view_;
 
   // For find in page. This may be NULL if there is no find bar, and if it is
   // non-NULL, it may or may not be visible.
   scoped_ptr<FindBarMac> find_bar_;
 
+  // Used to get notifications about renderers coming and going.
+  NotificationRegistrar registrar_;
+
+  // Used to render the sad tab. This will be non-NULL only when the sad tab is
+  // visible.
+  scoped_cftyperef<SadTabView*> sad_tab_;
+
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewMac);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_