Do-not-commit: Count layout tree memory usage

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceClipper.h

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 47 matching lines @@
   void beginClipExpansion() {
     DCHECK(!m_inClipExpansion);
     m_inClipExpansion = true;
   }
   void endClipExpansion() {
     DCHECK(m_inClipExpansion);
     m_inClipExpansion = false;
   }
 
  private:
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutSVGResourceContainer::approximateHeapMemoryUsage();
+    // TODO(pdr): Include memory from m_clipContentPath.
+    // TODO(pdr): Include memory from m_cachedPaintRecord.
+    return memory;
+  }
+
   void calculateLocalClipBounds();
 
   // Return true if the clip path was calculated or a cached value is available.
   bool calculateClipContentPathIfNeeded();
 
   // Cache of the clip path when using path clipping.
   Path m_clipContentPath;
 
   // Cache of the clip path paint record when falling back to masking for
   // clipping.
   sk_sp<const PaintRecord> m_cachedPaintRecord;
 
   FloatRect m_localClipBounds;
 
   // Reference cycle detection.
   bool m_inClipExpansion;
 };
 
 DEFINE_LAYOUT_SVG_RESOURCE_TYPE_CASTS(LayoutSVGResourceClipper,
                                       ClipperResourceType);
 
 }  // namespace blink
 
 #endif