Do-not-commit: Count layout tree memory usage

third_party/WebKit/Source/core/paint/ObjectPaintProperties.h

 // Copyright 2015 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.
 
 #ifndef ObjectPaintProperties_h
 #define ObjectPaintProperties_h
 
 #include "core/CoreExport.h"
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/graphics/paint/ClipPaintPropertyNode.h"
@@ skipping 33 matching lines @@
 // 2. It preserves existing child->parent pointers.
 class CORE_EXPORT ObjectPaintProperties {
   WTF_MAKE_NONCOPYABLE(ObjectPaintProperties);
   USING_FAST_MALLOC(ObjectPaintProperties);
 
  public:
   static std::unique_ptr<ObjectPaintProperties> create() {
     return WTF::wrapUnique(new ObjectPaintProperties());
   }
 
+  char heapMemoryUsage() const {
+    char memory = 0;
+    if (m_paintOffsetTranslation)
+      memory += sizeof(TransformPaintPropertyNode);
+    if (m_transform)
+      memory += sizeof(TransformPaintPropertyNode);
+    if (m_effect)
+      memory += sizeof(EffectPaintPropertyNode);
+    if (m_filter)
+      memory += sizeof(EffectPaintPropertyNode);
+    if (m_mask)
+      memory += sizeof(EffectPaintPropertyNode);
+    if (m_maskClip)
+      memory += sizeof(ClipPaintPropertyNode);
+    if (m_cssClip)
+      memory += sizeof(ClipPaintPropertyNode);
+    if (m_cssClipFixedPosition)
+      memory += sizeof(ClipPaintPropertyNode);
+    if (m_innerBorderRadiusClip)
+      memory += sizeof(ClipPaintPropertyNode);
+    if (m_overflowClip)
+      memory += sizeof(ClipPaintPropertyNode);
+    if (m_perspective)
+      memory += sizeof(TransformPaintPropertyNode);
+    if (m_svgLocalToBorderBoxTransform)
+      memory += sizeof(TransformPaintPropertyNode);
+    if (m_scrollTranslation) {
+      memory += sizeof(TransformPaintPropertyNode);
+      memory += sizeof(ScrollPaintPropertyNode);
+    }
+    if (m_scrollbarPaintOffset)
+      memory += sizeof(TransformPaintPropertyNode);
+    if (m_localBorderBoxProperties)
+      memory += sizeof(PropertyTreeState);
+    if (m_contentsProperties)
+      memory += sizeof(PropertyTreeState);
+    return memory;
+  }
+
+  bool hasContentsProperties() const { return !!m_contentsProperties; }
+
   // The hierarchy of the transform subtree created by a LayoutObject is as
   // follows:
   // [ paintOffsetTranslation ]           Normally paint offset is accumulated
   // |                                    without creating a node until we see,
   // |                                    for example, transform or
   // |                                    position:fixed.
   // +---[ transform ]                    The space created by CSS transform.
   //     |                                This is the local border box space,
   //     |                                see: localBorderBoxProperties below.
   //     +---[ perspective ]              The space created by CSS perspective.
@@ skipping 312 matching lines @@
   RefPtr<TransformPaintPropertyNode> m_scrollTranslation;
   RefPtr<TransformPaintPropertyNode> m_scrollbarPaintOffset;
 
   std::unique_ptr<PropertyTreeState> m_localBorderBoxProperties;
   mutable std::unique_ptr<PropertyTreeState> m_contentsProperties;
 };
 
 }  // namespace blink
 
 #endif  // ObjectPaintProperties_h