Add Device Policy Handler for Bluetooth, and allow disabling the Bluetooth adapter on Chrome OS

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 8333 matching lines @@
       'caption': '''Whitelist of USB detachable devices''',
       'tags': ['system-security'],
       'desc': '''Defines the list of USB devices that are allowed to be detached from their kernel driver in order to be used through the chrome.usb API directly inside a web application. Entries are pairs of USB Vendor Identifier and Product Identifier to identify a specific hardware.
 
       If this policy is not configured, the list of a detachable USB devices is considered as empty.''',
     },
     {
       'name': 'DeviceAllowBluetooth',
       'type': 'main',
       'schema': { 'type': 'boolean' },
       'supported_on': ['chrome_os:51-'],

[bartfab (slow), 2016/04/18 13:43:44]

Nit: s/51/52/

[Ivan Šandrk, 2016/04/18 15:09:18]

Done.

       'device_only': True,
       'features': {
-        'dynamic_refresh': True,
+        'dynamic_refresh': False,

[bartfab (slow), 2016/04/18 13:43:44]

Nit: I think we should explicitly document that after enabling Bluetooth, the
device must be rebooted.

[Ivan Šandrk, 2016/04/18 15:09:18]

Done.

       },
       'example_value': True,
       'id': 323,
       'caption': '''Allow bluetooth on device''',
       'tags': [],
       'desc': '''If this policy is set to false, <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph> will disable Bluetooth and the user cannot enable it back.
 
       If this policy is set to true or left unset, the user will be able to enable or disable Bluetooth as he wishes.
 
       If this policy is set, the user cannot change or override it.''',
@@ skipping 213 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': [],
 }