Set drive as the default download folder

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 1040 matching lines @@
 
       If the value of this policy is 0, the default cache size will be used but the user will not be able to change it.
 
       If this policy is not set the default size will be used and the user will be able to override it with the --media-cache-size flag.''',
       'label': '''Set media disk cache size''',
     },
     {
       'name': 'DownloadDirectory',
       'type': 'string',
       'schema': { 'type': 'string' },
-      'supported_on': ['chrome.*:11-'],
+      'supported_on': ['chrome.*:11-', 'chrome_os:35-'],
       'features': {
         'can_be_recommended': True,
         'dynamic_refresh': True,
         'per_profile': True,
       },
       'example_value': '/home/${user_name}/Downloads',
       'id': 64,
       'caption': '''Set download directory''',
       'desc': '''Configures the directory that <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> will use for downloading files.
 
@@ skipping 5397 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': [],
 }