Web Animations CSS: Start running animations on the compositor

Source/core/rendering/RenderLayerCompositor.cpp

Index: Source/core/rendering/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/RenderLayerCompositor.cpp b/Source/core/rendering/RenderLayerCompositor.cpp
index 0215204f02e0813b97bd4627c0eccb1f038a325c..7dbf2e305f8562b0532c03c203603ef26a94f725 100644
--- a/Source/core/rendering/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/RenderLayerCompositor.cpp
@@ -30,6 +30,7 @@
 #include "CSSPropertyNames.h"
 #include "HTMLNames.h"
 #include "RuntimeEnabledFeatures.h"
+#include "core/animation/ActiveAnimations.h"
 #include "core/dom/FullscreenElementStack.h"
 #include "core/dom/NodeList.h"
 #include "core/html/HTMLCanvasElement.h"
@@ -1677,7 +1678,17 @@ bool RenderLayerCompositor::requiresCompositingForAnimation(RenderObject* render
 {
     if (!(m_compositingTriggers & ChromeClient::AnimationTrigger))
         return false;
-    return renderer->animation().isRunningAcceleratableAnimationOnRenderer(renderer);
+
+    if (!RuntimeEnabledFeatures::webAnimationsEnabled())
+        return renderer->animation().isRunningAcceleratableAnimationOnRenderer(renderer);
+
+    if (!renderer->node() || !renderer->node()->isElementNode())
+        return false;
+
+    if (const ActiveAnimations* activeAnimations = toElement(renderer->node())->activeAnimations())
+        return activeAnimations->hasCandidateForCompositorAnimation();
+
+    return false;
 }
 
 bool RenderLayerCompositor::requiresCompositingForTransition(RenderObject* renderer) const
@@ -1868,7 +1879,7 @@ bool RenderLayerCompositor::isRunningAcceleratedTransformAnimation(RenderObject*
 {
     if (!(m_compositingTriggers & ChromeClient::AnimationTrigger))
         return false;
-    return renderer->animation().isRunningAnimationOnRenderer(renderer, CSSPropertyWebkitTransform);
+    return isRunningCompositorAnimation(*renderer, CSSPropertyWebkitTransform);
 }
 
 // If an element has negative z-index children, those children render in front of the