Prepare for responsive CSS animations.

Source/core/animation/InterpolationEffect.h

Index: Source/core/animation/InterpolationEffect.h
diff --git a/Source/core/animation/InterpolationEffect.h b/Source/core/animation/InterpolationEffect.h
index f6c4f0d1b73eaac65a0ed3d76fe1ca7c13fd3bdb..20e384912186eef27168408fe2914e95fcb28fd0 100644
--- a/Source/core/animation/InterpolationEffect.h
+++ b/Source/core/animation/InterpolationEffect.h
@@ -30,6 +30,8 @@ public:
 
     void addInterpolationsFromKeyframes(CSSPropertyID, Element*, Keyframe::PropertySpecificKeyframe& keyframeA, Keyframe::PropertySpecificKeyframe& keyframeB, double applyFrom, double applyTo);
 
+    void setDeferredInterpolationsOutdated();

[alancutter (OOO until 2018), 2015/02/05 04:59:02]

Just expose begin() and end() so you can for loop this at the callsite.
It's not right to make InterpolationEffect aware of specialised problems.

[alancutter (OOO until 2018), 2015/02/05 22:04:28]

After discussing this offline we realised this would be exposing
InterpolationRecords instead of Interpolations. It'd be too messy to wrap the
Iterator in a transform so let's go with a simple forEach instead:

keyframeEffect.forEach([](const Interpolation& interpolation){
    toStyleInterpolation(interpolation).underlyingStyleUpdated();
});

[shend, 2015/02/06 03:16:24]

Done.

+
     void trace(Visitor*);
 
 private: