cc: Unify namespaces for all test files

cc/picture_layer_tiling_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.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 {
 
 class PictureLayerTilingIteratorTest : public testing::Test {
  public:
   PictureLayerTilingIteratorTest() {}
   virtual ~PictureLayerTilingIteratorTest() {}
 
   void Initialize(gfx::Size tile_size,
                   float contents_scale,
                   gfx::Size layer_bounds) {
     client_.SetTileSize(tile_size);
@@ skipping 89 matching lines @@
   VerifyTilesExactlyCoverRect(2.0f, gfx::Rect(512, 365, 253, 182));
 
   float scale = 6.7f;
   gfx::Size bounds(800, 600);
   gfx::Rect full_rect(gfx::ToCeiledSize(gfx::ScaleSize(bounds, scale)));
   Initialize(gfx::Size(256, 512), 5.2f, bounds);
   VerifyTilesExactlyCoverRect(scale, full_rect);
   VerifyTilesExactlyCoverRect(scale, gfx::Rect(2014, 1579, 867, 1033));
 }
 
+}  // namespace
 }  // namespace cc