CC: Add curve (whole animation) timing function to compositor animations.

cc/blink/web_float_animation_curve_impl.cc

Index: cc/blink/web_float_animation_curve_impl.cc
diff --git a/cc/blink/web_float_animation_curve_impl.cc b/cc/blink/web_float_animation_curve_impl.cc
index e4c5fa988a950fc8049a0cfb4a4611b8f66557c3..34f2fc652595e8b3891a63ffc957846981634377 100644
--- a/cc/blink/web_float_animation_curve_impl.cc
+++ b/cc/blink/web_float_animation_curve_impl.cc
@@ -47,6 +47,20 @@ void WebFloatAnimationCurveImpl::add(const WebFloatKeyframe& keyframe,
           .PassAs<cc::TimingFunction>()));
 }
 
+#if WEB_ANIMATION_SUPPORTS_ANIMATION_TIMING
+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).PassAs<cc::TimingFunction>());
+}
+#endif
+
 float WebFloatAnimationCurveImpl::getValue(double time) const {
   return curve_->GetValue(time);
 }