Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

components/bubble/bubble_close_reason.h

Index: components/bubble/bubble_close_reason.h
diff --git a/components/bubble/bubble_close_reason.h b/components/bubble/bubble_close_reason.h
new file mode 100644
index 0000000000000000000000000000000000000000..bfd84b329145c1c193d97c5de3f9e42ad2683b05
--- /dev/null
+++ b/components/bubble/bubble_close_reason.h
@@ -0,0 +1,41 @@
+// 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_CLOSE_REASON_H_
+#define COMPONENTS_BUBBLE_BUBBLE_CLOSE_REASON_H_
+
+// List of reasons why a bubble might close. These correspond to various events
+// from the UI. Not all platforms will receive all events.
+enum BubbleCloseReason {
+  // Bubble was closed without any user interaction.
+  BUBBLE_CLOSE_FOCUS_LOST,
+
+  // User did not interact with the bubble, but changed tab.
+  BUBBLE_CLOSE_TABSWITCHED,
+
+  // User did not interact with the bubble, but detached the tab.
+  BUBBLE_CLOSE_TABDETACHED,
+
+  // User dismissed the bubble. (ESC, close, etc.)
+  BUBBLE_CLOSE_USER_DISMISSED,
+
+  // There has been a navigation event. (Link, URL typed, refresh, etc.)
+  BUBBLE_CLOSE_NAVIGATED,
+
+  // The parent window has entered or exited fullscreen mode. Will also be
+  // called for immersive fullscreen.
+  BUBBLE_CLOSE_FULLSCREEN_TOGGLED,
+
+  // The user selected an affirmative response in the bubble.
+  BUBBLE_CLOSE_ACCEPTED,
+
+  // The user selected a negative response in the bubble.
+  BUBBLE_CLOSE_CANCELED,
+
+  // The bubble WILL be closed regardless of return value for |ShouldClose|.
+  // Ex: The bubble's parent window is being destroyed.
+  BUBBLE_CLOSE_FORCED,
+};
+
+#endif  // COMPONENTS_BUBBLE_BUBBLE_CLOSE_REASON_H_