Add ability for a BubbleReference to update the BubbleUI.

components/bubble/bubble_controller.h

 // Copyright 2015 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 COMPONENTS_BUBBLE_BUBBLE_CONTROLLER_H_
 #define COMPONENTS_BUBBLE_BUBBLE_CONTROLLER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
 #include "components/bubble/bubble_close_reason.h"
 
 class BubbleDelegate;
 class BubbleManager;
-class BubbleUI;
+class BubbleUi;
 
 // BubbleController is responsible for the lifetime of the delegate and its UI.
 class BubbleController : public base::SupportsWeakPtr<BubbleController> {
  public:
   explicit BubbleController(BubbleManager* manager,
                             scoped_ptr<BubbleDelegate> delegate);
   virtual ~BubbleController();
 
   // Calls CloseBubble on the associated BubbleManager.
   bool CloseBubble(BubbleCloseReason reason);
 
+  // Calls UpdateBubbleUi on the associated BubbleManager.
+  // Returns true if the UI was updated.
+  bool UpdateBubbleUi();
+
  private:
   friend class BubbleManager;
 
   // Creates and shows the UI for the delegate.
   void Show();
 
   // Notifies the bubble UI that it should update its anchor location.
   // Important when there's a UI change (ex: fullscreen transition).
   void UpdateAnchorPosition();
 
   // Cleans up the delegate and its UI if it closed.
   // Returns true if the bubble was closed.
   bool ShouldClose(BubbleCloseReason reason);
 
   BubbleManager* manager_;
   scoped_ptr<BubbleDelegate> delegate_;
-  scoped_ptr<BubbleUI> bubble_ui_;
+  scoped_ptr<BubbleUi> bubble_ui_;
+
+  // Verify that functions that affect the UI are done on the same thread.
+  base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleController);
 };
 
 #endif  // COMPONENTS_BUBBLE_BUBBLE_CONTROLLER_H_