Add policy to control valid UDP port range in WebRTC

components/policy/resources/policy_templates.json

Index: components/policy/resources/policy_templates.json
diff --git a/components/policy/resources/policy_templates.json b/components/policy/resources/policy_templates.json
index 36d615170dc9a92c178936d0bcec4415df65af59..3bf5af5e329b28c1988482b0ade52966768c9b8d 100644
--- a/components/policy/resources/policy_templates.json
+++ b/components/policy/resources/policy_templates.json
@@ -8775,6 +8775,23 @@
 
       If this setting is not configured then users are able to turn Android Backup Service on and off in the Android Settings app.''',
     },
+    {
+      'name': 'WebRtcUdpPortRange',
+      'type': 'string',
+      'schema': { 'type': 'string' },
+      'supported_on': ['chrome.*:54-', 'chrome_os:54-'],
+      'features': {
+        'dynamic_refresh': False,
+        'per_profile': True,
+      },
+      'example_value': '10000-11999',
+      'id': 338,
+      'caption': '''Restrict the UDP port range used by WebRTC''',
+      'tags': [],
+      'desc': '''Restricts the UDP port range used by WebRTC in this machine.
+
+      If this policy is left not set, or if it is set to an empty string or an invalid port range, WebRTC will be allowed to use any available port.''',
+    },
   ],
   'messages': {
     # Messages that are not associated to any policies.