Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

components/bubble/bubble_manager.h

Index: components/bubble/bubble_manager.h
diff --git a/components/bubble/bubble_manager.h b/components/bubble/bubble_manager.h
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+// 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_MANAGER_H_
+#define COMPONENTS_BUBBLE_BUBBLE_MANAGER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "components/bubble/bubble_close_reason.h"
+
+class BubbleController;
+class BubbleDelegate;
+
+typedef base::WeakPtr<BubbleController> BubbleReference;
+
+// Inherit from BubbleManager to show, update, and close bubbles.
+// Any class that inherits from BubbleManager should capture any events that
+// should dismiss a bubble or update its anchor point.
+// This class assumes that we won't be showing a lot of bubbles simultaneously.
+// TODO(hcarmona): Handle simultaneous bubbles. http://crbug.com/366937
+class BubbleManager {
+ public:
+  // Should be instantiated on the UI thread.
+  BubbleManager();
+  virtual ~BubbleManager();
+
+  // Shows a specific bubble and returns a reference to it.
+  // This reference should be used through the BubbleManager.
+  BubbleReference ShowBubble(scoped_ptr<BubbleDelegate> bubble);
+
+  // Notify a bubble of an event that might trigger close.
+  // Returns true if the bubble was actually closed.
+  bool CloseBubble(BubbleReference bubble, BubbleCloseReason reason);
+
+  // Notify all bubbles of an event that might trigger close.
+  void CloseAllBubbles(BubbleCloseReason reason);
+
+  // Notify all bubbles that their anchor or parent may have changed.
+  void UpdateAllBubbleAnchors();
+
+ private:
+  enum ManagerStates {
+    SHOW_BUBBLES,
+    QUEUE_BUBBLES,
+    NO_MORE_BUBBLES,
+  };
+
+  // Show any bubbles that were added to |show_queue_|.
+  void ShowPendingBubbles();
+
+  // Verify that functions that affect the UI are done on the same thread.
+  base::ThreadChecker thread_checker_;
+
+  // Determines what happens to a bubble when |ShowBubble| is called.
+  ManagerStates manager_state_;
+
+  // The bubbles that are being managed.
+  ScopedVector<BubbleController> controllers_;
+
+  // The bubbles queued to be shown when possible.
+  ScopedVector<BubbleController> show_queue_;
+
+  DISALLOW_COPY_AND_ASSIGN(BubbleManager);
+};
+
+#endif  // COMPONENTS_BUBBLE_BUBBLE_MANAGER_H_