Turn off the old compositing path for SPv2.

third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp

Index: third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp b/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp
index 79321fb3ed5ece415829117039910ffd6c52f24a..d503ab78d171498ea369f6223c85306be250f9db 100644
--- a/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp
+++ b/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp
@@ -442,7 +442,7 @@ int PropertyTreeManager::switchToEffectNode(const EffectPaintPropertyNode& nextE
         m_effectStack.removeLast();
 
 #if DCHECK_IS_ON()
-    DCHECK(m_isFirstEffectEver || currentEffectNode()) << "Malformed effect tree. Nodes in the same property tree should have common root.";
+    DCHECK(m_isFirstEffectEver || currentEffectNode()) << "Malformed effect tree. Nodes in the same property tree should have common root. " << &nextEffect;
     m_isFirstEffectEver = false;
 #endif
     buildEffectNodesRecursively(&nextEffect);