Store compositor element id in paint properties for animated objects.

third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.cpp b/third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.cpp
index 85a7293c94577cdf82bc49b29e42b7501c77979e..38d423b998911a6e9bd62244f8f0fe630e193b20 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.cpp
@@ -26,11 +26,12 @@ cc::Layer* EffectPaintPropertyNode::ensureDummyLayer() const {
 String EffectPaintPropertyNode::toString() const {
   return String::format(
       "parent=%p localTransformSpace=%p outputClip=%p opacity=%f filter=%s "
-      "blendMode=%s directCompositingReasons=%s",
+      "blendMode=%s directCompositingReasons=%s compositorElementId=(%d, %d)",
       m_parent.get(), m_localTransformSpace.get(), m_outputClip.get(),
       m_opacity, m_filter.toString().ascii().data(),
       SkBlendMode_Name(m_blendMode),
-      compositingReasonsAsString(m_directCompositingReasons).ascii().data());
+      compositingReasonsAsString(m_directCompositingReasons).ascii().data(),
+      m_compositorElementId.primaryId, m_compositorElementId.secondaryId);
 }
 
 }  // namespace blink