Recomposite transform animations when CSS zoom changes

Source/core/animation/css/CSSAnimations.cpp

Index: Source/core/animation/css/CSSAnimations.cpp
diff --git a/Source/core/animation/css/CSSAnimations.cpp b/Source/core/animation/css/CSSAnimations.cpp
index b6e38541be9178181b1c81aa14f2879ab4c3cd7f..1612fb80c43048c4816bfc8a9dc715a370cda60e 100644
--- a/Source/core/animation/css/CSSAnimations.cpp
+++ b/Source/core/animation/css/CSSAnimations.cpp
@@ -241,6 +241,20 @@ void CSSAnimations::calculateCompositorAnimationUpdate(CSSAnimationUpdate& updat
             }
         }
     }
+
+    if (oldStyle.effectiveZoom() != style.effectiveZoom()) {

[dstockwell, 2015/09/17 04:07:13]

early out if !oldStyle.isRunningTransformAnimationOnCompositor

[alancutter (OOO until 2018), 2015/09/17 04:21:45]

Done. Added early out of entire function for when no compositor animations are
present.

+        for (auto& entry : elementAnimations->animations()) {
+            Animation& animation = *entry.key;
+            if (animation.effect() && animation.effect()->isKeyframeEffect()) {
+                EffectModel* model = toKeyframeEffect(animation.effect())->model();
+                if (model && model->isKeyframeEffectModel()) {
+                    KeyframeEffectModelBase* keyframeEffect = toKeyframeEffectModelBase(model);
+                    if (keyframeEffect->affects(PropertyHandle(CSSPropertyTransform)) && keyframeEffect->snapshotAllCompositorKeyframes(element, &style))
+                        update.updateCompositorKeyframes(&animation);
+                }
+            }
+        }
+    }
 }
 
 void CSSAnimations::calculateAnimationUpdate(CSSAnimationUpdate& update, const Element* animatingElement, Element& element, const ComputedStyle& style, ComputedStyle* parentStyle, StyleResolver* resolver)