cc: Unify namespaces for all test files

cc/picture_layer_tiling_set_unittest.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/picture_layer_tiling_set.h"
 
 #include "cc/test/fake_picture_layer_tiling_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/size_conversions.h"
 
 namespace cc {
+namespace {
 
 TEST(PictureLayerTilingSetTest, NoResources) {
   FakePictureLayerTilingClient client;
   PictureLayerTilingSet set(&client);
   gfx::Size default_tile_size(256, 256);
 
   gfx::Size layer_bounds(1000, 800);
   set.SetLayerBounds(layer_bounds);
 
   set.AddTiling(1.0, default_tile_size);
@@ skipping 12 matching lines @@
     EXPECT_TRUE(content_rect.Contains(geometry_rect));
     ASSERT_TRUE(remaining.Contains(geometry_rect));
     remaining.Subtract(geometry_rect);
 
     // No tiles have resources, so no iter represents a real tile.
     EXPECT_FALSE(*iter);
   }
   EXPECT_TRUE(remaining.IsEmpty());
 }
 
+}  // namespace
 }  // namespace cc