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third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 9fca55f4f81012ca7107e2c2842cefaaf4385a0d..bb9c79b26b540f64f5eddba6d74a430b9808b5a5 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -131,6 +131,8 @@
 #include "wtf/StdLibExtras.h"
 #include <memory>
 
+#include "core/paint/PaintPropertyTreePrinter.h"
+
 // Used to check for dirty layouts violating document lifecycle rules.
 // If arg evaluates to true, the program will continue. If arg evaluates to
 // false, program will crash if DCHECK_IS_ON() or return false from the current
@@ -3052,6 +3054,8 @@ void FrameView::prePaint() {
   forAllNonThrottledFrameViews([](FrameView& frameView) {
     frameView.lifecycle().advanceTo(DocumentLifecycle::PrePaintClean);
   });
+
+  showAllPropertyTrees(*this);
 }
 
 void FrameView::notifyPaint(const PaintController& paintController) const {