Statistics of LayoutBox rare data reasons

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/ObjectPaintInvalidator.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/api/LayoutPartItem.h"
@@ skipping 424 matching lines @@
   DCHECK(m_object.hasLocationInBacking() ==
          locationInBackingMap().contains(&m_object));
   if (location == m_object.visualRect().location()) {
     if (m_object.hasLocationInBacking()) {
       locationInBackingMap().erase(&m_object);
       m_object.getMutableForPainting().setHasPreviousLocationInBacking(false);
     }
   } else {
     locationInBackingMap().set(&m_object, location);
     m_object.getMutableForPainting().setHasPreviousLocationInBacking(true);
+    m_object.m_rareStat.addReason(ReasonLOPreviousLocation);
+
+    if (m_object.visualRect().isEmpty())
+      m_object.m_rareStat.addReason(ReasonLocationOffsetObject);
+    if (m_object.isBox())
+      m_object.m_rareStat.addReason(ReasonLocationOffsetBox);
+    if (m_object.isText())
+      m_object.m_rareStat.addReason(ReasonLocationOffsetText);
+    if (m_object.isLayoutInline())
+      m_object.m_rareStat.addReason(ReasonLocationOffsetInline);
+    if (m_object.isSVG())
+      m_object.m_rareStat.addReason(ReasonLocationOffsetSVG);
   }
 }
 
 void ObjectPaintInvalidatorWithContext::fullyInvalidatePaint(
     PaintInvalidationReason reason,
     const LayoutRect& oldVisualRect,
     const LayoutRect& newVisualRect) {
   // The following logic avoids invalidating twice if one set of bounds contains
   // the other.
   if (!newVisualRect.contains(oldVisualRect)) {
@@ skipping 191 matching lines @@
 
   m_context.paintingLayer->setNeedsRepaint();
   m_object.invalidateDisplayItemClients(reason);
   return reason;
 }
 
 DisablePaintInvalidationStateAsserts::DisablePaintInvalidationStateAsserts()
     : m_disabler(&gDisablePaintInvalidationStateAsserts, true) {}
 
 }  // namespace blink