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 a6d19dabaaddd373032a3854330f6df91721fe52..d00cca2a8bc6e9319306af9f99bde2b04648d5bc 100644
--- a/cc/blink/web_transform_animation_curve_impl.cc
+++ b/cc/blink/web_transform_animation_curve_impl.cc
@@ -54,6 +54,21 @@ void WebTransformAnimationCurveImpl::add(const WebTransformKeyframe& keyframe,
           .PassAs<cc::TimingFunction>()));
 }
 
+#if WEB_ANIMATION_SUPPORTS_ANIMATION_TIMING
+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).PassAs<cc::TimingFunction>());
+}
+#endif
+
 scoped_ptr<cc::AnimationCurve>
 WebTransformAnimationCurveImpl::CloneToAnimationCurve() const {
   return curve_->Clone();