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

cc/blink/web_transform_animation_curve_impl.cc

Index: cc/blink/web_transform_animation_curve_impl.cc
diff --git a/cc/blink/web_transform_animation_curve_impl.cc b/cc/blink/web_transform_animation_curve_impl.cc
index 3b2313f49a73cf2c2ff771976a967afc1c709a14..f91d94b27c1bae009224b7463299b0e60c41815c 100644
--- a/cc/blink/web_transform_animation_curve_impl.cc
+++ b/cc/blink/web_transform_animation_curve_impl.cc
@@ -53,6 +53,19 @@ void WebTransformAnimationCurveImpl::add(const WebTransformKeyframe& keyframe,
       cc::CubicBezierTimingFunction::Create(x1, y1, x2, y2)));
 }
 
+void WebTransformAnimationCurveImpl::setTimingFunction(
+    TimingFunctionType type) {
+  curve_->SetTimingFunction(CreateTimingFunction(type));
+}
+
+void WebTransformAnimationCurveImpl::setTimingFunction(double x1,
+                                                       double y1,
+                                                       double x2,
+                                                       double y2) {
+  curve_->SetTimingFunction(
+      cc::CubicBezierTimingFunction::Create(x1, y1, x2, y2).Pass());
+}
+
 scoped_ptr<cc::AnimationCurve>
 WebTransformAnimationCurveImpl::CloneToAnimationCurve() const {
   return curve_->Clone();