Adds more BUILD.gns to ash

ash/test/ash_test_environment.h

 // Copyright 2016 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 ASH_TEST_ASH_TEST_ENVIRONMENT_H_
 #define ASH_TEST_ASH_TEST_ENVIRONMENT_H_
 
 #include <memory>
 #include <string>
 
 namespace base {
 class SequencedWorkerPool;
 }
 
 namespace views {
 class ViewsDelegate;
 }
 
 namespace ash {
 namespace test {
 
 // AshTestEnvironment creates objects specific to an environment. Two
 // environments are provided, one for content (AshTestEnvironmentContent)
 // and one without content (AshTestEnvironmentDefault).
 //
 // AshTestBase creates an AshTestEnvironment by way of
 // AshTestEnvironment::Create(). The implementation of Create() depends upon
-// the ash target that was linked against: //ash:test_support_with_content
-// includes AshTestEnvironmentContent and //ash:test_support_without_content
-// includes AshTestEnvironmentDefault.
+// the ash target that was linked against: //ash/test:test_support_with_content
+// includes AshTestEnvironmentContent and
+// //ash/test:test_support_without_content includes AshTestEnvironmentDefault.
 class AshTestEnvironment {
  public:
   virtual ~AshTestEnvironment() {}
 
   // Creates the object appropriate to the current environment.
   static std::unique_ptr<AshTestEnvironment> Create();
 
   // Returns the ASCII file name of where the 100% resources are stored.
   static std::string Get100PercentResourceFileName();
 
   // Called from AshTestHelper::SetUp()/TearDown().
   virtual void SetUp() {}
   virtual void TearDown() {}
 
   virtual base::SequencedWorkerPool* GetBlockingPool() = 0;
 
   virtual std::unique_ptr<views::ViewsDelegate> CreateViewsDelegate() = 0;
 
  protected:
   AshTestEnvironment() {}
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_ASH_TEST_ENVIRONMENT_H_