cc: Unify namespaces for all test files

cc/test/layer_test_common.h

 // 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.
 
 #ifndef CC_TEST_LAYER_TEST_COMMON_H_
 #define CC_TEST_LAYER_TEST_COMMON_H_
 
 namespace cc {
 class QuadList;
 }
 
 namespace gfx {
 class Rect;
 }
 
+namespace cc {
 namespace LayerTestCommon {
 
 extern const char* quadString;
 
 void verifyQuadsExactlyCoverRect(const cc::QuadList&, const gfx::Rect&);
 
 } // namespace LayerTestCommon
+} // namespace cc
+
 #endif  // CC_TEST_LAYER_TEST_COMMON_H_