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diff --git a/chrome/browser/gtk/throb_controller_gtk.h b/chrome/browser/gtk/throb_controller_gtk.h
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+++ b/chrome/browser/gtk/throb_controller_gtk.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.
+
+#ifndef CHROME_BROWSER_GTK_THROB_CONTROLLER_GTK_H_
+#define CHROME_BROWSER_GTK_THROB_CONTROLLER_GTK_H_
+
+#include "app/throb_animation.h"
+#include "base/scoped_ptr.h"
+
+typedef struct _GtkWidget GtkWidget;
+
+// This class handles the "throbbing" of a GtkChromeButton. The visual effect
+// of throbbing is created by painting partially transparent hover effects. It
+// only works in non-gtk theme mode. This class mainly exists to glue an
+// AnimationDelegate (C++ class) to a GtkChromeButton* (GTK/c object). Usage is
+// as follows:
+//
+//   GtkWidget* button = gtk_chrome_button_new();
+//   ThrobControllerGtk::ThrobFor(button);
+//
+// The ThrobFor() function will handle creation of the ThrobControllerGtk
+// object, which will delete itself automatically when the throbbing is done,
+// or when the widget is destroyed. It may also be canceled prematurely with
+//
+//   ThrobControllerGtk* throbber =
+//       ThrobControllerGtk::GetThrobControllerGtk(button);
+//   throbber->Destroy();
+class ThrobControllerGtk : public AnimationDelegate {
+ public:
+  virtual ~ThrobControllerGtk();
+
+  GtkWidget* button() { return button_; }
+
+  // Throb for |cycles| cycles. This will override the current remaining
+  // number of cycles.
+  void StartThrobbing(int cycles);
+
+  // Get the ThrobControllerGtk for a given GtkChromeButton*. It is an error
+  // to call this on a widget that is not a GtkChromeButton*.
+  static ThrobControllerGtk* GetThrobControllerGtk(GtkWidget* button);
+
+  // Make |button| throb. It is an error to try to have two ThrobControllerGtk
+  // instances for one GtkChromeButton*.
+  static void ThrobFor(GtkWidget* button);
+
+  // Stop throbbing and delete |this|.
+  void Destroy();
+
+ private:
+  explicit ThrobControllerGtk(GtkWidget* button);
+
+  // Overridden from AnimationDelegate.
+  virtual void AnimationProgressed(const Animation* animation);
+  virtual void AnimationEnded(const Animation* animation);
+  virtual void AnimationCanceled(const Animation* animation);
+
+  static void OnButtonDestroy(GtkWidget* widget,
+                              ThrobControllerGtk* button);
+
+  ThrobAnimation animation_;
+  GtkWidget* button_;
+
+  DISALLOW_COPY_AND_ASSIGN(ThrobControllerGtk);
+};
+
+#endif  // CHROME_BROWSER_GTK_THROB_CONTROLLER_GTK_H_