cc: Keep tilings texture size in sync

cc/layers/picture_layer_impl_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_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <utility>
@@ skipping 4924 matching lines @@
   EXPECT_EQ(result.width(), 192);
   EXPECT_EQ(result.height(), 192);
   result = layer->CalculateTileSize(gfx::Size(199, 199));
   EXPECT_EQ(result.width(), 200);
   EXPECT_EQ(result.height(), 200);
 
   // Gpu-rasterization uses 25% viewport-height tiles.
   // The +2's below are for border texels.
   host_impl_.SetUseGpuRasterization(true);
   host_impl_.SetViewportSize(gfx::Size(2000, 2000));
+
+  Region empty_invalidation;
+  const PictureLayerTilingSet* null_tiling_set = nullptr;
+  scoped_refptr<RasterSource> raster_source =
+      FakePicturePileImpl::CreateEmptyPile(gfx::Size(100, 100),
+                                           gfx::Size(0, 0));
+  layer->UpdateRasterSource(raster_source, &empty_invalidation, null_tiling_set,
+                            host_impl_.device_viewport_size());
   result = layer->CalculateTileSize(gfx::Size(10000, 10000));
   EXPECT_EQ(result.width(), 2000);
   EXPECT_EQ(result.height(), 500 + 2);
 
   // Clamp and round-up, when smaller than viewport.
   // Tile-height doubles to 50% when width shrinks to <= 50%.
   host_impl_.SetViewportSize(gfx::Size(1000, 1000));
+  layer->UpdateRasterSource(raster_source, &empty_invalidation, null_tiling_set,
+                            host_impl_.device_viewport_size());
   result = layer->CalculateTileSize(gfx::Size(447, 10000));
   EXPECT_EQ(result.width(), 448);
   EXPECT_EQ(result.height(), 500 + 2);
 
   // Largest layer is 50% of viewport width (rounded up), and
   // 50% of viewport in height.
   result = layer->CalculateTileSize(gfx::Size(447, 400));
   EXPECT_EQ(result.width(), 448);
   EXPECT_EQ(result.height(), 448);
   result = layer->CalculateTileSize(gfx::Size(500, 499));
   EXPECT_EQ(result.width(), 512);
   EXPECT_EQ(result.height(), 500 + 2);
 }
 
 }  // namespace
 }  // namespace cc