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

cc/blink/web_filter_animation_curve_impl.cc

Index: cc/blink/web_filter_animation_curve_impl.cc
diff --git a/cc/blink/web_filter_animation_curve_impl.cc b/cc/blink/web_filter_animation_curve_impl.cc
index cfbe191cb23345c495352737f354c8e3eb0dbd46..14d4a8f87bc25be18356eb5eeba0c2f1a207e568 100644
--- a/cc/blink/web_filter_animation_curve_impl.cc
+++ b/cc/blink/web_filter_animation_curve_impl.cc
@@ -50,6 +50,20 @@ void WebFilterAnimationCurveImpl::add(const WebFilterKeyframe& keyframe,
           .PassAs<cc::TimingFunction>()));
 }
 
+#if WEB_ANIMATION_SUPPORTS_ANIMATION_TIMING
+void WebFilterAnimationCurveImpl::setTimingFunction(TimingFunctionType type) {
+  curve_->SetTimingFunction(CreateTimingFunction(type));
+}
+
+void WebFilterAnimationCurveImpl::setTimingFunction(double x1,
+                                                    double y1,
+                                                    double x2,
+                                                    double y2) {
+  curve_->SetTimingFunction(cc::CubicBezierTimingFunction::Create(
+                                x1, y1, x2, y2).PassAs<cc::TimingFunction>());
+}
+#endif
+
 scoped_ptr<cc::AnimationCurve>
 WebFilterAnimationCurveImpl::CloneToAnimationCurve() const {
   return curve_->Clone();