Makes tile-creation lazy

cc/test/fake_picture_layer_tiling_client.cc

 // Copyright 2012 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.
 
 #include "cc/test/fake_picture_layer_tiling_client.h"
 
 #include <limits>
 
 namespace cc {
 
@@ skipping 35 matching lines @@
                                      gfx::Rect(),
                                      1,
                                      0));
 }
 
 void FakePictureLayerTilingClient::SetTileSize(gfx::Size tile_size) {
   tile_size_ = tile_size;
 }
 
 gfx::Size FakePictureLayerTilingClient::CalculateTileSize(
-    gfx::Size /* current_tile_size */,
     gfx::Size /* content_bounds */) {
   return tile_size_;
 }
 
+const Region* FakePictureLayerTilingClient::GetInvalidation() {
+  return NULL;
+}
+
+const PictureLayerTiling* FakePictureLayerTilingClient::GetTwinTiling(
+      const PictureLayerTiling* tiling) {
+  return NULL;
+}
+
 }  // namespace cc