Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

components/bubble/bubble_delegate.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_DELEGATE_H_
+#define COMPONENTS_BUBBLE_BUBBLE_DELEGATE_H_
+
+class BubbleBuilder;
+
+class BubbleDelegate {
+ public:
+  BubbleDelegate() {}
+  virtual ~BubbleDelegate() {}
+
+  virtual void OnShow() = 0;
+  virtual void OnHide() = 0;
+
+  // TODO(hcarmona): remove this?
+  virtual void OnUpdatePosition() = 0;
+
+  virtual void BuildBubble(BubbleBuilder* builder) = 0;
+};
+
+#endif  // COMPONENTS_BUBBLE_BUBBLE_DELEGATE_H_