Makes tile-creation lazy

cc/test/fake_picture_layer_tiling_client.cc

Index: cc/test/fake_picture_layer_tiling_client.cc
diff --git a/cc/test/fake_picture_layer_tiling_client.cc b/cc/test/fake_picture_layer_tiling_client.cc
index 94302f2d2665bf9376f1fc660a42ea9e4cd7d3a6..27e7f9247232a5ae33d646c95b5682127393a266 100644
--- a/cc/test/fake_picture_layer_tiling_client.cc
+++ b/cc/test/fake_picture_layer_tiling_client.cc
@@ -55,9 +55,17 @@ void FakePictureLayerTilingClient::SetTileSize(gfx::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