CC: Decouple tile-grid-size from tile-size.

cc/layers/picture_layer_unittest.cc

 // Copyright 2013 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/layers/picture_layer.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer_impl.h"
 #include "cc/resources/resource_update_queue.h"
 #include "cc/test/fake_layer_tree_host.h"
@@ skipping 66 matching lines @@
   // Layer is suitable for gpu rasterization by default.
   EXPECT_TRUE(pile->is_suitable_for_gpu_rasterization());
   EXPECT_TRUE(layer->IsSuitableForGpuRasterization());
 
   // Veto gpu rasterization.
   pile->SetUnsuitableForGpuRasterizationForTesting();
   EXPECT_FALSE(pile->is_suitable_for_gpu_rasterization());
   EXPECT_FALSE(layer->IsSuitableForGpuRasterization());
 }
 
+TEST(PictureLayerTest, UseTileGridSize) {
+  LayerTreeSettings settings;
+  settings.default_tile_grid_size = gfx::Size(123, 123);
+
+  MockContentLayerClient client;
+  scoped_refptr<PictureLayer> layer = PictureLayer::Create(&client);
+  FakeLayerTreeHostClient host_client(FakeLayerTreeHostClient::DIRECT_3D);
+  scoped_ptr<FakeLayerTreeHost> host =
+      FakeLayerTreeHost::Create(&host_client, settings);
+  host->SetRootLayer(layer);
+
+  // Tile-grid is set according to its setting.
+  SkTileGridFactory::TileGridInfo info =
+      layer->GetPicturePileForTesting()->GetTileGridInfoForTesting();
+  EXPECT_EQ(info.fTileInterval.width(), 123 - 2 * info.fMargin.width());
+  EXPECT_EQ(info.fTileInterval.height(), 123 - 2 * info.fMargin.height());
+}
+
 }  // namespace
 }  // namespace cc