Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

chrome/browser/ui/views/bubble/views_bubble_controller.cc

Index: chrome/browser/ui/views/bubble/views_bubble_controller.cc
diff --git a/chrome/browser/ui/views/bubble/views_bubble_controller.cc b/chrome/browser/ui/views/bubble/views_bubble_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..95a7cbe99c59e0ae8b6f8461152cd56365390704
--- /dev/null
+++ b/chrome/browser/ui/views/bubble/views_bubble_controller.cc
@@ -0,0 +1,16 @@
+// 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.
+
+#include "chrome/browser/ui/views/bubble/views_bubble_controller.h"
+
+ViewsBubbleController::ViewsBubbleController(BubbleManager* manager,
+                                             BubbleDelegate* delegate)
+    : BubbleController(manager, delegate) {}

[please use gerrit instead, 2015/07/22 00:09:36]

Why have a separate class for ViewsBubbleController that has no differences from
the base class BubbleController? We usually don't add code that we will need in
the future, because plans might change in unexpected ways.

+
+// Static.
+scoped_ptr<BubbleController> BubbleController::Create(
+    BubbleManager* manager,
+    BubbleDelegate* delegate) {
+  return make_scoped_ptr(new ViewsBubbleController(manager, delegate));
+}