Implement SkPicture::bytesUsed() for SkRecord backend

src/core/SkRTree.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkRTree.h"
 
 SkRTree::SkRTree(SkScalar aspectRatio) : fCount(0), fAspectRatio(aspectRatio) {}
@@ skipping 152 matching lines @@
     for (int i = 0; i < node->fNumChildren; ++i) {
         if (SkRect::Intersects(node->fChildren[i].fBounds, query)) {
             if (0 == node->fLevel) {
                 results->push(node->fChildren[i].fOpIndex);
             } else {
                 this->search(node->fChildren[i].fSubtree, query, results);
             }
         }
     }
 }
+
+size_t SkRTree::bytesUsed() const {
+    size_t byteCount = sizeof(SkRTree);
+
+    byteCount += fNodes.reserved() * sizeof(Node);
+
+    return byteCount;
+}