Statistics of LayoutBox rare data reasons

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 756 matching lines @@
     if (childHas3D) {
       m_has3DTransformedDescendant = true;
       break;
     }
   }
 }
 
 void PaintLayer::updateLayerPosition() {
   LayoutPoint localPoint;
 
+  if (!layoutObject().isOutOfFlowPositioned() && parent() &&
+      parent()->layoutObject().isLayoutInline() &&
+      ((parent()->parent() &&
+        !parent()->parent()->layoutObject().isLayoutBlock()) ||
+       parent()->location() != LayoutPoint())) {
+    auto reason = layoutObject().isFloating() ? ReasonLOFloatLayerBug1
+                                              : ReasonLOFloatLayerBug2;
+    for (LayoutObject* object = layoutObject().parent();
+         object && object != parent()->layoutObject();
+         object = object->parent()) {
+      if (object->isFloating()) {
+        object->m_rareStat.addReason(reason);
+        LOG(ERROR) << "Found: !!! " << reason;
+      }
+    }
+  }
+
   bool didResize = false;
   if (layoutObject().isInline() && layoutObject().isLayoutInline()) {
     LayoutInline& inlineFlow = toLayoutInline(layoutObject());
     IntRect lineBox = enclosingIntRect(inlineFlow.linesBoundingBox());
     m_size = lineBox.size();
   } else if (LayoutBox* box = layoutBox()) {
     IntSize newSize = pixelSnappedIntSize(box->size(), box->location());
     didResize = newSize != m_size;
     m_size = newSize;
     localPoint.moveBy(box->physicalLocation());
@@ skipping 2463 matching lines @@
 }
 
 void showLayerTree(const blink::LayoutObject* layoutObject) {
   if (!layoutObject) {
     LOG(INFO) << "Cannot showLayerTree. Root is (nil)";
     return;
   }
   showLayerTree(layoutObject->enclosingLayer());
 }
 #endif