Add controlled setting indicator for proxy configuration

chrome/test/data/policy/policy_test_cases.json

 {
   "-- Template --": {
     "intro": "Top-level entries map a policy name to its test parameters, described below.",
 
     "os": ["List of operating systems that support this policy. Valid values:", "win", "linux", "mac", "chromeos"],
     "official_only": "Whether this policy exists in official builds only. Defaults to |false| if not specified.",
     "can_be_recommended": "Whether a recommended value may be set for the policy. Defaults to |false| if not specified.",
     "test_policy": "A policy dictionary that should trigger the managed banner in the settings UI. Usually just sets the current policy.",
     "settings_pages": ["A list of settings pages where the banner should be visible when this policy is set."],
     "note": "If the policy affects any preferences, the following array should be specified with one entry per such preference.",
@@ skipping 444 matching lines @@
     ],
 
     "note": "TODO(bartfab): Flag this with can_be_recommended when http://crbug.com/106682 is fixed."
   },
 
   "ProxyMode": {
     "os": ["win", "mac", "linux"],
     "test_policy": { "ProxyMode": "direct" },
     "settings_pages": [],
     "pref_mappings": [
-      { "pref": "proxy" }
+      { "pref": "proxy",
+        "indicator_tests": [
+          { "policy": { "ProxyMode": "direct" } }
+        ]
+      }
     ],
 
     "note": "TODO(joaodasilva): Should be chrome://settings-frame. http://crbug.com/97749"
   },
 
   "ProxyServerMode": {
     "os": ["win", "mac", "linux"],
     "test_policy": { "ProxyServerMode": 0 },
     "settings_pages": [],
     "pref_mappings": [
-      { "pref": "proxy" }
+      { "pref": "proxy",
+        "indicator_tests": [
+          { "policy": { "ProxyServerMode": 0 } }
+        ]
+      }
     ],
 
     "note": "TODO(joaodasilva): Should be chrome://settings-frame. http://crbug.com/97749"
   },
 
   "ProxyServer": {
     "os": ["win", "mac", "linux"],
     "test_policy": { "ProxyMode": "fixed_servers", "ProxyServer": "http://localhost:8080" },
     "settings_pages": [],
     "pref_mappings": [
-      { "pref": "proxy" }
+      { "pref": "proxy",
+        "indicator_tests": [
+          { "policy": { "ProxyMode": "fixed_servers", "ProxyServer": "http://localhost:8080" } }
+        ]
+      }
     ]
   },
 
   "ProxyPacUrl": {
     "os": ["win", "mac", "linux"],
     "test_policy": { "ProxyMode": "pac_script", "ProxyPacUrl": "http://localhost:8080/proxy.pac" },
     "settings_pages": [],
     "pref_mappings": [
-      { "pref": "proxy" }
+      { "pref": "proxy",
+        "indicator_tests": [
+          { "policy": { "ProxyMode": "pac_script", "ProxyPacUrl": "http://localhost:8080/proxy.pac" } }
+        ]
+      }
     ]
   },
 
   "ProxyBypassList": {
     "os": ["win", "mac", "linux"],
     "test_policy": { "ProxyMode": "fixed_servers", "ProxyServer": "http://localhost:8080", "ProxyBypassList": "localhost" },
     "settings_pages": [],
     "pref_mappings": [
-      { "pref": "proxy" }
+      { "pref": "proxy",
+        "indicator_tests": [
+          { "policy": { "ProxyMode": "fixed_servers", "ProxyServer": "http://localhost:8080", "ProxyBypassList": "localhost" } }
+        ]
+      }
     ]
   },
 
   "ProxySettings": {
     "os": ["linux", "win"],
     "test_policy": { "ProxySettings": { "ProxyMode": "direct" } },
     "settings_pages": [],
     "pref_mappings": [
-      { "pref": "proxy" }
+      { "pref": "proxy",
+        "indicator_tests": [
+          { "policy": { "ProxySettings": { "ProxyMode": "direct" } } }
+        ]
+      }
     ]
   },
 
   "EnableOriginBoundCerts": {
     "os": ["win", "mac", "linux"],
     "test_policy": { "EnableOriginBoundCerts": true },
     "settings_pages": [],
     "pref_mappings": [
       { "pref": "ssl.origin_bound_certs.enabled",
         "local_state": true
@@ skipping 1157 matching lines @@
     "test_policy": { "GCFUserDataDir": "${user_name}/test-frame" },
     "settings_pages": []
   },
 
   "AdditionalLaunchParameters": {
     "os": [],
     "test_policy": { "AdditionalLaunchParameters": "--enable-media-stream" },
     "settings_pages": []
   }
 }