Refactored DeviceStatusCollector to enable truely asynchronous status queries

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 4925 matching lines @@
     },
     {
       'name': 'ReportUploadFrequency',
       'type': 'int',
       'schema': { 'type': 'integer', 'minimum': 60000 },
       'supported_on': ['chrome_os:42-'],
       'device_only': True,
       'features': {
         'dynamic_refresh': True,
       },
-      'example_value': 180000,
+      'example_value': 10800000,
       'id': 292,
       'caption': '''Frequency of device status report uploads''',
       'tags': ['admin-sharing'],
       'desc': '''How frequently device status uploads are sent, in milliseconds.
 
       If this policy is unset, the default frequency is 3 hours. The minimum
       allowed frequency is 60 seconds.''',
       'arc_support': 'This policy has no effect on the logging done by Android.',
     },
     {
@@ skipping 4153 matching lines @@
       '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">https://www.chromium.org/administrators/complex-policies-on-windows<ex>https://www.chromium.org/administrators/complex-policies-on-windows</ex></ph>''',
     },
   },
   'placeholders': [],
 }