Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

components/bubble/bubble_ui.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_UI_H_
+#define COMPONENTS_BUBBLE_BUBBLE_UI_H_
+
+class BubbleUI {
+ public:
+  virtual ~BubbleUI() {}
+
+ private:
+  friend class BubbleController;
+
+  // These methods should only be called by the BubbleController.
+
+  // Should display the bubble UI
+  virtual void Show() = 0;
+
+  // Should hide the bubble UI
+  virtual void Hide() = 0;
+
+  // Should update the bubble UI's position
+  virtual void UpdateAnchorPosition() = 0;
+};
+
+#endif  // COMPONENTS_BUBBLE_BUBBLE_UI_H_