Define step timing function for the cc animation framework.

cc/blink/web_float_animation_curve_impl.cc

 // 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.
 
 #include "cc/blink/web_float_animation_curve_impl.h"
 
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/timing_function.h"
 #include "cc/blink/web_animation_curve_common.h"
@@ skipping 28 matching lines @@
 void WebFloatAnimationCurveImpl::add(const WebFloatKeyframe& keyframe,
                                      double x1,
                                      double y1,
                                      double x2,
                                      double y2) {
   curve_->AddKeyframe(cc::FloatKeyframe::Create(
       base::TimeDelta::FromSecondsD(keyframe.time), keyframe.value,
       cc::CubicBezierTimingFunction::Create(x1, y1, x2, y2)));
 }
 
+void WebFloatAnimationCurveImpl::add(const WebFloatKeyframe& keyframe,
+                                     int steps,
+                                     float steps_start_offset) {
+  curve_->AddKeyframe(cc::FloatKeyframe::Create(
+      base::TimeDelta::FromSecondsD(keyframe.time), keyframe.value,
+      cc::StepsTimingFunction::Create(steps, steps_start_offset)));
+}
+
 void WebFloatAnimationCurveImpl::setTimingFunction(TimingFunctionType type) {
   curve_->SetTimingFunction(CreateTimingFunction(type));
 }
 
 void WebFloatAnimationCurveImpl::setTimingFunction(double x1,
                                                    double y1,
                                                    double x2,
                                                    double y2) {
   curve_->SetTimingFunction(
       cc::CubicBezierTimingFunction::Create(x1, y1, x2, y2).Pass());
 }
 
 float WebFloatAnimationCurveImpl::getValue(double time) const {
   return curve_->GetValue(base::TimeDelta::FromSecondsD(time));
 }
 
 scoped_ptr<cc::AnimationCurve>
 WebFloatAnimationCurveImpl::CloneToAnimationCurve() const {
   return curve_->Clone();
 }
 
 }  // namespace cc_blink