Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

components/bubble/bubble_delegate.h

Index: components/bubble/bubble_delegate.h
diff --git a/components/bubble/bubble_delegate.h b/components/bubble/bubble_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..42758bd5629be863d48d32d543312715507080fd
--- /dev/null
+++ b/components/bubble/bubble_delegate.h
@@ -0,0 +1,24 @@
+// 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_