Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

components/bubble/bubble_builder.h

Index: components/bubble/bubble_builder.h
diff --git a/components/bubble/bubble_builder.h b/components/bubble/bubble_builder.h
new file mode 100644
index 0000000000000000000000000000000000000000..5c7c04399df2ee31d10b93875cd953626ac0b656
--- /dev/null
+++ b/components/bubble/bubble_builder.h
@@ -0,0 +1,26 @@
+// 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_BUILDER_H__
+#define COMPONENTS_BUBBLE_BUBBLE_BUILDER_H__
+
+#include "ui/gfx/native_widget_types.h"
+
+class BubbleBuilder {
+ public:
+  BubbleBuilder() {}
+  virtual ~BubbleBuilder() {}
+
+  // TODO(hcarmona): Temporary until the builder can build UI.
+  void SetNativeWindow(gfx::NativeWindow* bubble) { bubble_ = bubble; }
+
+  // Builds a native window to use as a bubble.
+  gfx::NativeWindow* GetNativeWindow() { return bubble_; }
+
+ private:
+  // TODO(hcarmona): Temporary until the builder can build UI.
+  gfx::NativeWindow* bubble_;
+};
+
+#endif  // COMPONENTS_BUBBLE_BUBBLE_BUILDER_H__