Move property tree debugging code to platform/graphics/paint/ (try #2)

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

Index: third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.cpp b/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.cpp
index 8f2317a75fc1dba07ef262829306ce000d3fb0de..852b5243edb25b2eb73911ebda9fa37f3370faaf 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.cpp
@@ -73,4 +73,13 @@ const PropertyTreeState* PropertyTreeStateIterator::next() {
   return nullptr;
 }
 
+#if DCHECK_IS_ON()
+
+String PropertyTreeState::toTreeString() const {
+  return transform()->toTreeString() + "\n" + clip()->toTreeString() + "\n" +
+         effect()->toTreeString() + "\n" + scroll()->toTreeString();
+}
+
+#endif
+
 }  // namespace blink