material throbber, take 2

ui/views/controls/throbber.h

 // Copyright (c) 2012 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 UI_VIEWS_CONTROLS_THROBBER_H_
 #define UI_VIEWS_CONTROLS_THROBBER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
@@ skipping 94 matching lines @@
   void SetChecked(bool checked);
 
   void set_preferred_diameter(int diameter) { preferred_diameter_ = diameter; }
 
   // View implementation.
   gfx::Size GetPreferredSize() const override;
   int GetHeightForWidth(int w) const override;
   void OnPaint(gfx::Canvas* canvas) override;
 
  private:
+  // Paints this throbber in the "waiting" state, for example when waiting for
+  // an initial network response.
+  void PaintWaiting(gfx::Canvas* canvas);
+
+  // Paints this throbber in its normal state. Corresponds to MD throbber.
+  void PaintSpinning(gfx::Canvas* canvas);
+
+  // Common painting code for PaintWaiting and PaintSpinning.
+  void PaintArc(gfx::Canvas* canvas, SkScalar start_angle, SkScalar sweep);
+
   // The preferred width and height for this view. Zero indicates the size is
   // set by the parent class (i.e. matches the size of the pre-material
   // sprites).
   int preferred_diameter_;
 
   // Whether or not we should display a checkmark.
   bool checked_;
 
   // The checkmark image. Will be null until it's used (if ever).
   const gfx::ImageSkia* checkmark_;
 
   DISALLOW_COPY_AND_ASSIGN(MaterialThrobber);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_THROBBER_H_