CC: Allow per-curve timing functions to be steps timing functions

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 36 matching lines @@
 }
 
 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) {
+void WebFloatAnimationCurveImpl::setLinearTimingFunction() {
+  curve_->SetTimingFunction(nullptr);
+}
+
+void WebFloatAnimationCurveImpl::setCubicBezierTimingFunction(
+    TimingFunctionType type) {
   curve_->SetTimingFunction(CreateTimingFunction(type));
 }
 
-void WebFloatAnimationCurveImpl::setTimingFunction(double x1,
-                                                   double y1,
-                                                   double x2,
-                                                   double y2) {
+void WebFloatAnimationCurveImpl::setCubicBezierTimingFunction(double x1,
+                                                              double y1,
+                                                              double x2,
+                                                              double y2) {
   curve_->SetTimingFunction(
       cc::CubicBezierTimingFunction::Create(x1, y1, x2, y2).Pass());
 }
 
+void WebFloatAnimationCurveImpl::setStepsTimingFunction(
+    int number_of_steps,
+    float steps_start_offset) {
+  curve_->SetTimingFunction(cc::StepsTimingFunction::Create(
+                                number_of_steps, steps_start_offset).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