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

cc/blink/web_transform_animation_curve_impl.h

Index: cc/blink/web_transform_animation_curve_impl.h
diff --git a/cc/blink/web_transform_animation_curve_impl.h b/cc/blink/web_transform_animation_curve_impl.h
index 95ca90242e78db4bce57464a3f74cc51a115c203..1d9fa11ab120e0e7d203ba1821940acaaf960cd8 100644
--- a/cc/blink/web_transform_animation_curve_impl.h
+++ b/cc/blink/web_transform_animation_curve_impl.h
@@ -38,6 +38,10 @@ class WebTransformAnimationCurveImpl
                    double y1,
                    double x2,
                    double y2);
+#if WEB_ANIMATION_SUPPORTS_ANIMATION_TIMING
+  virtual void setTimingFunction(TimingFunctionType = TimingFunctionTypeEase);
+  virtual void setTimingFunction(double x1, double y1, double x2, double y2);
+#endif
 
   scoped_ptr<cc::AnimationCurve> CloneToAnimationCurve() const;