Output object paint invalidation information of sub frames

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 3020 matching lines @@
 {
     if (!m_trackedObjectPaintInvalidations)
         return;
 
     ObjectPaintInvalidation invalidation = { client.debugName(), reason };
     m_trackedObjectPaintInvalidations->append(invalidation);
 }
 
 PassRefPtr<JSONArray> FrameView::trackedObjectPaintInvalidationsAsJSON() const
 {
-    if (!m_trackedObjectPaintInvalidations || m_trackedObjectPaintInvalidations->isEmpty())
+    if (!m_trackedObjectPaintInvalidations)
         return nullptr;
 
     RefPtr<JSONArray> result = JSONArray::create();
-    for (const auto& item : *m_trackedObjectPaintInvalidations) {
-        RefPtr<JSONObject> itemJSON = JSONObject::create();
-        itemJSON->setString("object", item.name);
-        itemJSON->setString("reason", paintInvalidationReasonToString(item.reason));
-        result->pushObject(itemJSON);
+    for (Frame* frame = m_frame->tree().top(); frame; frame = frame->tree().traverseNext()) {
+        if (!frame->isLocalFrame())
+            continue;
+        if (LayoutViewItem layoutView = toLocalFrame(frame)->contentLayoutItem()) {
+            for (const auto& item : *layoutView.frameView()->m_trackedObjectPaintInvalidations) {
+                RefPtr<JSONObject> itemJSON = JSONObject::create();
+                itemJSON->setString("object", item.name);
+                itemJSON->setString("reason", paintInvalidationReasonToString(item.reason));
+                result->pushObject(itemJSON);
+            }
+        }
     }
     return result;
 }
 
 void FrameView::addResizerArea(LayoutBox& resizerBox)
 {
     if (!m_resizerAreas)
         m_resizerAreas = wrapUnique(new ResizerAreaSet);
     m_resizerAreas->add(&resizerBox);
 }
@@ skipping 1198 matching lines @@
     return m_subtreeThrottled || (m_hiddenForThrottling && m_crossOriginForThrottling);
 }
 
 LayoutBox& FrameView::boxForScrollControlPaintInvalidation() const
 {
     ASSERT(!layoutViewItem().isNull());
     return *layoutView();
 }
 
 } // namespace blink