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diff --git a/chrome/browser/notifications/balloon_collection.h b/chrome/browser/notifications/balloon_collection.h
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+++ b/chrome/browser/notifications/balloon_collection.h
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+// Copyright (c) 2010 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.
+
+// Handles the visible notification (or balloons).
+
+#ifndef CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_H_
+#define CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_H_
+
+#include <deque>
+
+class Balloon;
+class Notification;
+class Profile;
+
+namespace gfx {
+class Size;
+}  // namespace gfx
+
+class BalloonCollection {
+ public:
+  class BalloonSpaceChangeListener {
+   public:
+    virtual ~BalloonSpaceChangeListener() {}
+
+    // Called when there is more or less space for balloons due to
+    // monitor size changes or balloons disappearing.
+    virtual void OnBalloonSpaceChanged() = 0;
+  };
+
+  static BalloonCollection* Create();
+
+  BalloonCollection()
+      : space_change_listener_(NULL) {
+  }
+
+  virtual ~BalloonCollection() {}
+
+  // Adds a new balloon for the specified notification.
+  virtual void Add(const Notification& notification,
+                   Profile* profile) = 0;
+
+  // Removes a balloon from the collection if present.  Returns
+  // true if anything was removed.
+  virtual bool Remove(const Notification& notification) = 0;
+
+  // Is there room to add another notification?
+  virtual bool HasSpace() const = 0;
+
+  // Request the resizing of a balloon.
+  virtual void ResizeBalloon(Balloon* balloon, const gfx::Size& size) = 0;
+
+  // Update for new screen dimensions.
+  virtual void DisplayChanged() = 0;
+
+  // Inform the collection that a balloon was closed.
+  virtual void OnBalloonClosed(Balloon* source) = 0;
+
+  // Get const collection of the active balloons.
+  typedef std::deque<Balloon*> Balloons;
+  virtual const Balloons& GetActiveBalloons() = 0;
+
+  BalloonSpaceChangeListener* space_change_listener() {
+    return space_change_listener_;
+  }
+  void set_space_change_listener(BalloonSpaceChangeListener* listener) {
+    space_change_listener_ = listener;
+  }
+
+ protected:
+  // Non-owned pointer to an object listening for space changes.
+  BalloonSpaceChangeListener* space_change_listener_;
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_H_