Initial QuadTree implementation

src/core/SkQuadTreePicture.cpp

Index: src/core/SkQuadTreePicture.cpp
diff --git a/src/core/SkQuadTreePicture.cpp b/src/core/SkQuadTreePicture.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d05e40f4b3233383ef32d230aaccc0747fcf98b1
--- /dev/null
+++ b/src/core/SkQuadTreePicture.cpp
@@ -0,0 +1,15 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkQuadTreePicture.h"
+
+#include "SkQuadTree.h"
+
+SkBBoxHierarchy* SkQuadTreePicture::createBBoxHierarchy() const {
+    return SkQuadTree::Create(fBounds);
+}
+