Added new policy Schema classes.

components/policy.gypi

 # Copyright 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'policy_component',
       'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
         'json_schema',
       ],
       'defines': [
         'POLICY_COMPONENT_IMPLEMENTATION',
       ],
       'include_dirs': [
         '..',
       ],
       'conditions': [
         ['configuration_policy==1', {
           'sources': [
             'policy/core/common/policy_schema.cc',
             'policy/core/common/policy_schema.h',
+            'policy/core/common/schema.cc',
+            'policy/core/common/schema.h',
+            'policy/core/common/schema_internal.h',
             'policy/policy_export.h',
           ],
         }, {  # configuration_policy==0
           # The target 'policy_component' always exists. Later it will include
           # some stubs when configuration_policy==0. For now this stub file is
           # compiled so that an output is produced, otherwise the shared build
           # breaks on iOS.
           # TODO(joaodasilva): remove this comment and the temporary stub after
           # moving one of the real stubs. http://crbug.com/271392
           'sources': [
             'policy/stub_to_remove.cc',
           ],
         }],
       ],
     },
   ],
 }