Add $ref support to policy schema

components/policy/resources/policy_templates.json

 {
 # policy_templates.json - Metafile for policy templates
 #
 # The content of this file is evaluated as a Python expression.
 #
 # This file is used as input to generate the following policy templates:
 # ADM, ADMX+ADML, MCX/plist and html documentation.
 #
 # Policy templates are user interface definitions or documents about the
 # policies that can be used to configure Chrome. Each policy is a name-value
@@ skipping 5268 matching lines @@
         },
         {
           'name': 'PowerManagementIdleSettings',
           'type': 'dict',
           'schema': {
             'type': 'object',
             'properties': {
               'AC': {
                 'description': 'Delays and actions to take when the device is idle and running on AC power',
                 'type': 'object',
+                'id': 'PowerManagementDelays',
                 'properties': {
                   'Delays': {
                     'type': 'object',
                     'properties': {
                       'ScreenDim': {
                         'description': 'The length of time without user input after which the screen is dimmed, in milliseconds',
                         'type': 'integer',
                         'minimum': 0
                       },
                       'ScreenOff': {
@@ skipping 15 matching lines @@
                   },
                   'IdleAction': {
                     'description': 'Action to take when the idle delay is reached',
                     'type': 'string',
                     'enum': [ 'Suspend', 'Logout', 'Shutdown', 'DoNothing' ]
                   }
                 }
               },
               'Battery': {
                 'description': 'Delays and actions to take when the device is idle and running on battery',
-                'type': 'object',
-                # TODO(binjin): Use $ref placeholder here once generated policy
-                # constants get full support of it. http://crbug.com/347082
-                'properties': {
-                  'Delays': {
-                    'type': 'object',
-                    'properties': {
-                      'ScreenDim': {
-                        'description': 'The length of time without user input after which the screen is dimmed, in milliseconds',
-                        'type': 'integer',
-                        'minimum': 0
-                      },
-                      'ScreenOff': {
-                        'description': 'The length of time without user input after which the screen is turned off, in milliseconds',
-                        'type': 'integer',
-                        'minimum': 0
-                      },
-                      'IdleWarning': {
-                        'description': 'The length of time without user input after which a warning dialog is shown, in milliseconds',
-                        'type': 'integer',
-                        'minimum': 0
-                      },
-                      'Idle': {
-                        'description': 'The length of time without user input after which the idle action is taken, in milliseconds',
-                        'type': 'integer',
-                        'minimum': 0
-                      }
-                    }
-                  },
-                  'IdleAction': {
-                    'description': 'Action to take when the idle delay is reached',
-                    'type': 'string',
-                    'enum': [ 'Suspend', 'Logout', 'Shutdown', 'DoNothing' ]
-                  }
-                }
-              },
+                '$ref': 'PowerManagementDelays'
+              }
             }
           },
           'supported_on': ['chrome_os:35-'],
           'features': {
             'dynamic_refresh': True,
             'per_profile': False,
           },
           'example_value': {
             'AC': {
               'IdleAction': 'DoNothing'
@@ skipping 76 matching lines @@
     },
     {
       'name': 'DeviceLoginScreenPowerManagement',
       'type': 'dict',
       'schema': {
         'type': 'object',
         'properties': {
           'AC': {
             'description': 'Power management settings applicable only when running on AC power',
             'type': 'object',
+            'id': 'DeviceLoginScreenPowerSettings',
             'properties': {
               'Delays': {
                 'type': 'object',
                 'properties': {
                   'ScreenDim': {
                     'description': 'The length of time without user input after which the screen is dimmed, in milliseconds',
                     'type': 'integer',
                     'minimum': 0
                   },
                   'ScreenOff': {
@@ skipping 10 matching lines @@
               },
               'IdleAction': {
                 'description': 'Action to take when the idle delay is reached',
                 'type': 'string',
                 'enum': [ 'Suspend', 'Shutdown', 'DoNothing' ]
               }
             }
           },
           'Battery': {
             'description': 'Power management settings applicable only when running on battery power',
-            'type': 'object',
-            'properties': {
-              'Delays': {
-                'type': 'object',
-                'properties': {
-                  'ScreenDim': {
-                    'description': 'The length of time without user input after which the screen is dimmed, in milliseconds',
-                    'type': 'integer',
-                    'minimum': 0
-                  },
-                  'ScreenOff': {
-                    'description': 'The length of time without user input after which the screen is turned off, in milliseconds',
-                    'type': 'integer',
-                    'minimum': 0
-                  },
-                  'Idle': {
-                    'description': 'The length of time without user input after which the idle action is taken, in milliseconds',
-                    'type': 'integer',
-                    'minimum': 0
-                  }
-                }
-              },
-              'IdleAction': {
-                'description': 'Action to take when the idle delay is reached',
-                'type': 'string',
-                'enum': [ 'Suspend', 'Shutdown', 'DoNothing' ]
-              }
-            }
+            '$ref': 'DeviceLoginScreenPowerSettings'
           },
           'LidCloseAction': {
             'description': 'Action to take when the lid is closed',
             'type': 'string',
             'enum': [ 'Suspend', 'Shutdown', 'DoNothing' ]
           },
           'UserActivityScreenDimDelayScale': {
             'description': 'Percentage by which the screen dim delay is scaled when user activity is observed while the screen is dimmed or soon after the screen has been turned off',
             'type': 'integer',
             'minimum': 100
@@ skipping 950 matching lines @@
       'desc': '''Text appended in parentheses to the policy name to indicate that it has been deprecated''',
       'text': 'deprecated',
     },
     'doc_recommended': {
       'desc': '''Text appended in parentheses next to the policies top-level container to indicate that those policies are of the Recommended level''',
       'text': 'Default Settings (users can override)',
     },
   },
   'placeholders': [],
 }