cc: Keep tilings texture size in sync

cc/layers/picture_layer_impl_unittest.cc

Index: cc/layers/picture_layer_impl_unittest.cc
diff --git a/cc/layers/picture_layer_impl_unittest.cc b/cc/layers/picture_layer_impl_unittest.cc
index 26f3be56a23caebd6f0d03a887f10974c5c2ea59..51502dbdca3c05f59ce82dfe8d7393d30789a2b1 100644
--- a/cc/layers/picture_layer_impl_unittest.cc
+++ b/cc/layers/picture_layer_impl_unittest.cc
@@ -4942,6 +4942,14 @@ TEST_F(TileSizeTest, TileSizes) {
   // 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);
@@ -4949,6 +4957,8 @@ TEST_F(TileSizeTest, TileSizes) {
   // 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);