Add mandatory policy setting for template generation

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 82 matching lines @@
 #     chrome.* -> Chrome policy definition list
 #     chrome_os -> Chrome policy definition list, when building OS_CHROMEOS
 #
 # Annotations:
 #   Additional information is specified under keys 'features' and
 #   'example_value'. These are used in the generated documentation and example
 #   policy configuration files. 'dynamic_refresh' controls if the generated
 #   documentation should state that the policy supports dynamic refresh or not.
 #   Supporting dynamic refresh means that Chrome respects the changes to the
 #   policy immediately, without the need for restart.
+#   'can_be_mandatory' can be set to False to exclude that policy in the
+#   mandatory policies template. This only affects the template generation;
+#   The default is True.
 #   'can_be_recommended' can be set to True to include that policy in the
 #   recommended policies templates. This only affects the template generation;
 #   all policies can be at the recommended level. The default is False.
 #
 #   The 'max_size' key is used to specify the maximal size of the external data
 #   that a policy can reference, in bytes. This annotation is compulsory for
 #   policies of type 'external'. It is ignored for all other policy types.
 #
 #   The 'future' key is used to indicate that a policy isn't yet ready for
 #   usage. It defaults to False, and currently affects the generated policy
@@ skipping 2623 matching lines @@
                 }
               },
               'required': ['protocol', 'url']
             }
           },
           'supported_on': ['chrome.*:37-', 'chrome_os:37-'],
           'features': {
             'dynamic_refresh': False,
             'per_profile': True,
             'can_be_recommended': True,
+            'can_be_mandatory' : False,
           },
           'example_value': [{'protocol': 'mailto', 'url': 'https://mail.google.com/mail/?extsrc=mailto&url=%s', 'default': 'true'}],
           'id': 268,
           'caption': '''Register protocol handlers''',
           'desc': '''Allows you to register a list of protocol handlers. This can only be a recommended policy. The property |protocol| should be set to the scheme such as 'mailto' and the property |url| should be set to the URL pattern of the application that handles the scheme. The pattern can include a '%s', which if present will be replaced by the handled URL.
 
           The protocol handlers registered by policy are merged with the ones registered by the user and both are available for use. The user can override the protocol handlers installed by policy by installing a new default handler, but cannot remove a protocol handler registered by policy.''',
         },
         {
           'name': 'PopupsBlockedForUrls',
@@ skipping 4023 matching lines @@
       'text': '''Description'''
     },
     'doc_feature_dynamic_refresh': {
       'desc': '''The name of the feature that indicates for a given policy that changes to it are respected by Chromium without a browser restart''',
       'text': '''Dynamic Policy Refresh'''
     },
     'doc_feature_can_be_recommended': {
       'desc': '''The name of the feature that indicates for a given policy that it can be recommended, instead of mandatory''',
       'text': '''Can Be Recommended'''
     },
+    'doc_feature_can_be_mandatory': {
+      'desc': '''The name of the feature that indicates for a given policy that it can be mandatory, instead of recommended''',
+      'text': '''Can Be Mandatory'''
+    },
     'doc_feature_per_profile': {
       'desc': '''The name of the feature that indicates whether a policy is applicable to browser Profiles individually or whether it affects the entire browser.''',
       'text': '''Per Profile'''
     },
     'doc_deprecated': {
       '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)',
     },
     'doc_complex_policies_on_windows': {
       'desc': '''Text pointing the user to a help article for complex policies on Windows''',
       'text': '''encoded as a JSON string, for details see <ph name="COMPLEX_POLICIES_URL">http://www.chromium.org/administrators/complex-policies-on-windows<ex>http://www.chromium.org/administrators/complex-policies-on-windows</ex></ph>''',
     },
   },
   'placeholders': [],
 }