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diff --git a/chrome/views/controls/throbber.h b/chrome/views/controls/throbber.h
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+// Copyright (c) 2006-2008 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.
+
+// Throbbers display an animation, usually used as a status indicator.
+
+#ifndef CHROME_VIEWS_CONTROLS_THROBBER_H_
+#define CHROME_VIEWS_CONTROLS_THROBBER_H_
+
+#include "base/basictypes.h"
+#include "base/time.h"
+#include "base/timer.h"
+#include "chrome/views/view.h"
+
+class SkBitmap;
+
+namespace views {
+
+class Throbber : public View {
+ public:
+  // |frame_time_ms| is the amount of time that should elapse between frames
+  //                 (in milliseconds)
+  // If |paint_while_stopped| is false, this view will be invisible when not
+  // running.
+  Throbber(int frame_time_ms, bool paint_while_stopped);
+  virtual ~Throbber();
+
+  // Start and stop the throbber animation
+  virtual void Start();
+  virtual void Stop();
+
+  // overridden from View
+  virtual gfx::Size GetPreferredSize();
+  virtual void Paint(ChromeCanvas* canvas);
+
+ protected:
+  // Specifies whether the throbber is currently animating or not
+  bool running_;
+
+ private:
+  void Run();
+
+  bool paint_while_stopped_;
+  int frame_count_;  // How many frames we have.
+  base::Time start_time_;  // Time when Start was called.
+  SkBitmap* frames_;  // Frames bitmaps.
+  base::TimeDelta frame_time_;  // How long one frame is displayed.
+  base::RepeatingTimer<Throbber> timer_;  // Used to schedule Run calls.
+
+  DISALLOW_COPY_AND_ASSIGN(Throbber);
+};
+
+// A SmoothedThrobber is a throbber that is representing potentially short
+// and nonoverlapping bursts of work.  SmoothedThrobber ignores small
+// pauses in the work stops and starts, and only starts its throbber after
+// a small amount of work time has passed.
+class SmoothedThrobber : public Throbber {
+ public:
+  SmoothedThrobber(int frame_delay_ms);
+
+  virtual void Start();
+  virtual void Stop();
+
+ private:
+  // Called when the startup-delay timer fires
+  // This function starts the actual throbbing.
+  void StartDelayOver();
+
+  // Called when the shutdown-delay timer fires.
+  // This function stops the actual throbbing.
+  void StopDelayOver();
+
+  base::OneShotTimer<SmoothedThrobber> start_timer_;
+  base::OneShotTimer<SmoothedThrobber> stop_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(SmoothedThrobber);
+};
+
+// A CheckmarkThrobber is a special variant of throbber that has three states:
+//   1. not yet completed (which paints nothing)
+//   2. working (which paints the throbber animation)
+//   3. completed (which paints a checkmark)
+//
+class CheckmarkThrobber : public Throbber {
+ public:
+  CheckmarkThrobber();
+
+  // If checked is true, the throbber stops spinning and displays a checkmark.
+  // If checked is false, the throbber stops spinning and displays nothing.
+  void SetChecked(bool checked);
+
+  // Overridden from Throbber:
+  virtual void Paint(ChromeCanvas* canvas);
+
+ private:
+  static const int kFrameTimeMs = 30;
+
+  static void InitClass();
+
+  // Whether or not we should display a checkmark.
+  bool checked_;
+
+  // The checkmark image.
+  static SkBitmap* checkmark_;
+
+  DISALLOW_COPY_AND_ASSIGN(CheckmarkThrobber);
+};
+
+}  // namespace views
+
+#endif  // CHROME_VIEWS_CONTROLS_THROBBER_H_