[Do not commit] Experiment to test for cache misses during recursion

third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp

Index: third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp
diff --git a/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp b/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp
index 9eb113c271eb2b5925b3f1b47ab2827c34e0d924..0c2fc8aaa9306b60204142e3eec70128e384d900 100644
--- a/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp
+++ b/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp
@@ -34,6 +34,11 @@ struct PrePaintTreeWalkContext {
 };
 
 void PrePaintTreeWalk::walk(FrameView& rootFrame) {
+  //LOG(INFO) << "sizeOf(PrePaintTreeWalkContext): " << sizeof(PrePaintTreeWalkContext);
+  //LOG(INFO) << "sizeOf(PaintPropertyTreeBuilderContext): " << sizeof(PaintPropertyTreeBuilderContext);
+  //LOG(INFO) << "sizeOf(PaintInvalidatorContext): " << sizeof(PaintInvalidatorContext);
+  //LOG(INFO) << "sizeOf(PaintLayer*): " << sizeof(PaintLayer*);
+
   DCHECK(rootFrame.frame().document()->lifecycle().state() ==
          DocumentLifecycle::InPrePaint);
 
@@ -45,14 +50,14 @@ void PrePaintTreeWalk::walk(FrameView& rootFrame) {
 }
 
 bool PrePaintTreeWalk::walk(FrameView& frameView,
-                            const PrePaintTreeWalkContext& parentContext) {
+                            PrePaintTreeWalkContext& context) {
   if (frameView.shouldThrottleRendering()) {
     // The walk was interrupted by throttled rendering so this subtree was not
     // fully updated.
     return false;
   }
 
-  PrePaintTreeWalkContext context(parentContext);
+  //PrePaintTreeWalkContext context(parentContext);
   m_propertyTreeBuilder.updateProperties(frameView, context.treeBuilderContext);
   m_paintInvalidator.invalidatePaintIfNeeded(frameView,
                                              context.paintInvalidatorContext);
@@ -99,8 +104,8 @@ static void updateAuxiliaryObjectProperties(const LayoutObject& object,
 }
 
 bool PrePaintTreeWalk::walk(const LayoutObject& object,
-                            const PrePaintTreeWalkContext& parentContext) {
-  PrePaintTreeWalkContext context(parentContext);
+                            PrePaintTreeWalkContext& context) {
+  //PrePaintTreeWalkContext context(parentContext);
 
   // This must happen before updateContextForBoxPosition, because the
   // latter reads some of the state computed uere.