Add ManagedModePolicyProvider and extension API to get and set policies.

chrome/common/extensions/api/managed_mode_private.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "managedModePrivate",
     "nodoc": true,
     "functions": [
       {
         "name": "enter",
         "type": "function",
         "description": "Shows a confirmation dialog, then puts the browser into managed mode. The callback parameter will be true if managed mode was entered successfully, false if the user cancelled the confirmation. If managed mode is already on, trying to enter it again will have no effect.",
         "parameters": [
           {
             "type": "function",
             "name": "callback",
             "optional": true,
             "parameters": [
               {
-                "name": "result", 
+                "name": "result",
                 "type": "object",
                 "description": "The result of the attempt to enter managed mode.",
                 "properties": {
                   "success": {
                     "description": "True if managed mode was entered successfully, false if the user cancelled the confirmation.",
                     "type": "boolean"
                   }
                 }
               }
             ]
@@ skipping 16 matching lines @@
                 "properties": {
                   "value": {
                     "description": "The value of the setting.",
                     "type": "boolean"
                   }
                 }
               }
             ]
           }
         ]
+      },
+      {
+        "name": "setPolicy",
+        "type": "function",
+        "description": "Sets a policy.",
+        "parameters": [
+          {
+            "name": "key",
+            "type": "string",
+            "description": "Policy key."
+          },
+          {
+            "name": "value",
+            "type": "any",
+            "description": "Policy value."
+          },
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "parameters": []
+          }
+        ]
+      },
+      {
+        "name": "getPolicy",
+        "type": "function",
+        "description": "Gets a policy value.",
+        "parameters": [
+          {
+            "name": "key",
+            "type": "string",
+            "description": "Policy key."
+          },
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "parameters": [
+              {
+                "name": "value",
+                "type": "any",
+                "description": "Policy value or null if no policy is set.",
+                "optional": true
+              }
+            ]
+          }
+        ]
       }
     ],
     "events": [
       {
         "name": "onChange",
         "description": "Fired when the value of the setting changes.",
         "parameters": [
           {
             "type": "object",
             "name": "details",
             "properties": {
               "value": {
                 "description": "The value of the setting.",
                 "type": "any"
               }
             }
           }
         ]
       }
     ]
   }
-]
+]