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_
+
+#include "base/memory/scoped_ptr.h"
+#include "components/bubble/bubble_close_reason.h"
+
+class BubbleUI;
+
+// Inherit from this class to define a bubble. A bubble is a small transient UI
+// surface anchored to a parent window. Most bubbles are dismissed when they
+// lose focus.
+class BubbleDelegate {
+ public:
+  BubbleDelegate();
+  virtual ~BubbleDelegate();
+
+  // Called by BubbleController to notify a bubble of an event that the bubble
+  // might want to close on. Return true if the bubble should close for the
+  // specified reason.
+  virtual bool ShouldClose(BubbleCloseReason reason);
+
+  // Called by BubbleController to build the UI that will represent this bubble.
+  // BubbleDelegate should not keep a reference to this newly created UI.
+  virtual scoped_ptr<BubbleUI> BuildBubbleUI() = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BubbleDelegate);
+};
+
+#endif  // COMPONENTS_BUBBLE_BUBBLE_DELEGATE_H_