Web Animations: Don't suppress graphics layer properties when cancelling animations

Source/core/animation/AnimationStack.cpp

Index: Source/core/animation/AnimationStack.cpp
diff --git a/Source/core/animation/AnimationStack.cpp b/Source/core/animation/AnimationStack.cpp
index d9645baebc7937b8c5962bd4550cdbd773676993..0a022c4c8605a5acd8ea7e6c52b066990dd8d3f9 100644
--- a/Source/core/animation/AnimationStack.cpp
+++ b/Source/core/animation/AnimationStack.cpp
@@ -73,8 +73,9 @@ AnimationStack::AnimationStack()
 
 bool AnimationStack::hasActiveAnimationsOnCompositor(CSSPropertyID property) const
 {
-    for (const auto& effect : m_effects) {
-        if (effect->effect() && effect->effect()->hasActiveAnimationsOnCompositor(property))
+    for (const auto& sampledEffect : m_effects) {
+        // TODO(dstockwell): move the playing check into AnimationEffect and expose both hasAnimations and hasActiveAnimations
+        if (sampledEffect->effect() && sampledEffect->effect()->animation()->playing() && sampledEffect->effect()->hasActiveAnimationsOnCompositor(property))

[esprehn, 2015/08/26 08:44:28]

Can you explain why this fixes the bug? Your description doesn't really explain
why adding a check for playing() fixes it.

             return true;
     }
     return false;