Define step timing function for the cc animation framework.

cc/blink/web_transform_animation_curve_impl.h

 // Copyright 2014 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 CC_BLINK_WEB_TRANSFORM_ANIMATION_CURVE_IMPL_H_
 #define CC_BLINK_WEB_TRANSFORM_ANIMATION_CURVE_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/blink/cc_blink_export.h"
 #include "third_party/WebKit/public/platform/WebTransformAnimationCurve.h"
@@ skipping 20 matching lines @@
 
   // blink::WebTransformAnimationCurve implementation.
   virtual void add(const blink::WebTransformKeyframe& keyframe);
   virtual void add(const blink::WebTransformKeyframe& keyframe,
                    TimingFunctionType type);
   virtual void add(const blink::WebTransformKeyframe& keyframe,
                    double x1,
                    double y1,
                    double x2,
                    double y2);
+  virtual void add(const blink::WebTransformKeyframe& keyframe,
+                   int steps,
+                   float stepsStartOffset);
+
   virtual void setTimingFunction(TimingFunctionType type);
   virtual void setTimingFunction(double x1, double y1, double x2, double y2);
 
   scoped_ptr<cc::AnimationCurve> CloneToAnimationCurve() const;
 
  private:
   scoped_ptr<cc::KeyframedTransformAnimationCurve> curve_;
 
   DISALLOW_COPY_AND_ASSIGN(WebTransformAnimationCurveImpl);
 };
 
 }  // namespace cc_blink
 
 #endif  // CC_BLINK_WEB_TRANSFORM_ANIMATION_CURVE_IMPL_H_