Statistics of LayoutBox rare data reasons

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 2972 matching lines @@
   dispatchEventsForPrintingOnAllFrames();
 }
 
 void FrameView::clearPrintContext() {
   if (!m_printContext)
     return;
   m_printContext->end();
   m_printContext.clear();
 }
 
+static int gFrameCounts[7];
+int* frameCounts() {
+  return gFrameCounts;
+}
+
+static void countFrames(const Frame& frame) {
+  gFrameCounts[0]++;
+  for (Frame* child = frame.tree().firstChild(); child;
+       child = child->tree().nextSibling()) {
+    if (!child->isLocalFrame()) {
+      gFrameCounts[1]++;
+      continue;
+    }
+    if (!child->ownerLayoutObject())
+      gFrameCounts[2]++;
+    if (FrameView* childView = toLocalFrame(child)->view()) {
+      if (childView->shouldThrottleRendering()) {
+        gFrameCounts[3]++;
+        if (!child->ownerLayoutObject())
+          gFrameCounts[4]++;
+      }
+      if (!childView->layoutView())
+        gFrameCounts[5]++;
+    } else {
+      gFrameCounts[6]++;
+    }
+    countFrames(*child);
+  }
+}
+
 // TODO(leviw): We don't assert lifecycle information from documents in child
 // PluginViews.
 void FrameView::updateLifecyclePhasesInternal(
     DocumentLifecycle::LifecycleState targetState) {
   if (m_currentUpdateLifecyclePhasesTargetState !=
       DocumentLifecycle::Uninitialized) {
     NOTREACHED() << "FrameView::updateLifecyclePhasesInternal() reentrance";
     return;
   }
 
@@ skipping 111 matching lines @@
       }
     }
 
     forAllNonThrottledFrameViews([](FrameView& frameView) {
       frameView.checkDoesNotNeedLayout();
       frameView.m_allowsLayoutInvalidationAfterLayoutClean = true;
     });
   }
 
   updateViewportIntersectionsForSubtree(targetState);
+
+  gFrameCounts[0] = gFrameCounts[1] = gFrameCounts[2] = gFrameCounts[3] =
+      gFrameCounts[4] = 0;
+  countFrames(*m_frame);
 }
 
 void FrameView::enqueueScrollAnchoringAdjustment(
     ScrollableArea* scrollableArea) {
   m_anchoringAdjustmentQueue.insert(scrollableArea);
 }
 
 void FrameView::performScrollAnchoringAdjustments() {
   for (WeakMember<ScrollableArea>& scroller : m_anchoringAdjustmentQueue) {
     if (scroller) {
@@ skipping 2123 matching lines @@
 void FrameView::setAnimationHost(
     std::unique_ptr<CompositorAnimationHost> host) {
   m_animationHost = std::move(host);
 }
 
 LayoutUnit FrameView::caretWidth() const {
   return LayoutUnit(getHostWindow()->windowToViewportScalar(1));
 }
 
 }  // namespace blink