add "always allow" option to the mediastream infobar and allow user to allow/not allow acces to devi

chrome/app/policy/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 94 matching lines @@
 #   templates and documentation. The policy definition list that Chrome sees
 #   will include policies marked with 'future'. If a WIP policy isn't meant to
 #   be seen by the policy providers either, the 'supported_on' key should be set
 #   to an empty list.
 #
 # IDs:
 #   Since a Protocol Buffer definition is generated from this file, unique and
 #   persistent IDs for all fields (but not for groups!) are needed. These are
 #   specified by the 'id' keys of each policy. NEVER CHANGE EXISTING IDs,
 #   because doing so would break the deployed wire format!
-#   For your editing convenience: highest ID currently used: 148
+#   For your editing convenience: highest ID currently used: 149
 #
 # Placeholders:
 #   The following placeholder strings are automatically substituted:
 #     $1 -> Google Chrome / Chromium
 #     $2 -> Google Chrome OS / Chromium OS
 #     $3 -> Google Chrome Frame / Chromium Frame
 #     $6 is reserved for doc_writer
 #
 # Device Policy:
 #   An additional flag device_only (optional, defaults to False) indicates
@@ skipping 1424 matching lines @@
           'supported_on': ['chrome.*:10-', 'chrome_os:0.11-'],
           'features': {'dynamic_refresh': True},
           'example_value': 0,
           'id': 54,
           'caption': '''Default geolocation setting''',
           'desc': '''Allows you to set whether websites are allowed to track the users' physical location. Tracking the users' physical location can be allowed by default, denied by default or the user can be asked every time a website requests the physical location.
 
           If this policy is left not set, 'AskGeolocation' will be used and the user will be able to change it.''',
         },
         {
+          'name': 'DefaultMediaStreamSetting',
+          'type': 'int-enum',
+          'items': [
+            {
+              'name': 'PromptOnAccess',
+              'value': 1,
+              'caption': '''Ask every time a site wants to access my camera and/or microphone'''
+            },
+            {
+              'name': 'BlockAccess',
+              'value': 2,
+              'caption': '''Do not allow any site to access my camera and microphone'''
+            },
+          ],
+          'supported_on': ['chrome.*:22-', 'chrome_os:0.22-'],
+          'features': {'dynamic_refresh': True},
+          'example_value': 2,
+          'id': 149,
+          'caption': '''Default mediastream setting''',
+          'desc': '''Allows you to set whether websites are allowed to get access to media capture devices. Access to media capture devices can be allowed by default, or the user can be asked every time a website wants to get access to media capture devices.
+
+          If this policy is left not set, 'PromptOnAccess' will be used and the user will be able to change it.''',
+        },
+        {
           'name': 'AutoSelectCertificateForUrls',
           'type': 'list',
           'supported_on': ['chrome.*:15-', 'chrome_os:0.15-'],
           'features': {'dynamic_refresh': True},
           'example_value': ["{\\\"pattern\\\":\\\"https://www.example.com\\\",\\\"filter\\\":{\\\"ISSUER\\\":{\\\"CN\\\":\\\"certificate issuer name\\\"}}}"],
           'id': 102,
           'caption': '''Automatically select client certificates for these sites''',
           'desc': '''Allows you to specify a list of url patterns that specify sites for which <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> should automatically select a client certificates, if the site requests a certificate.
 
           If this policy is left not set no auto-selection will be done for any site.''',
@@ skipping 1237 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': 'Recommended',
     },
   },
   'placeholders': [],
 }