Move property tree debugging code to platform/graphics/paint/.

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..2096153125109e4cb10db24742df3450fd19dd7c 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::treeAsString() const {
+  return transform()->treeAsString() + "\n" + clip()->treeAsString() + "\n" +

[wkorman, 2017/01/17 19:19:58]

nit: StringBuilder here also could be worthwhile, the four strings could be
large, not like performance is a big thing here though, fine either way.

[chrishtr, 2017/01/17 22:06:45]

Prefer to just leave it because it's debugging output.

+         effect()->treeAsString() + "\n" + scroll()->treeAsString();
+}
+
+#endif
+
 }  // namespace blink