Add browserAction.enable/disable as alias for pageAction.show/hide.

chrome/common/extensions/api/browser_action.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": "browserAction",
     "dependencies": [ "tabs" ],
     "types": [
       {
@@ skipping 241 matching lines @@
             "type": "function",
             "name": "callback",
             "parameters": [
               {
                 "name": "result",
                 "$ref": "ColorArray"
               }
             ]
           }
         ]
+      },
+      {
+        "name": "enable",
+        "type": "function",
+        "description": "Enables the browser action for a tab. By default, browser actions are enabled.",
+        "parameters": [
+          {
+            "type": "integer",
+            "optional": true,
+            "name": "tabId",
+            "minimum": 0,
+            "description": "The id of the tab for which you want to modify the browser action."
+          }
+        ]
+      },
+      {
+        "name": "disable",
+        "type": "function",
+        "description": "Disables the browser action for a tab.",
+        "parameters": [
+          {
+            "type": "integer",
+            "optional": true,
+            "name": "tabId",
+            "minimum": 0,
+            "description": "The id of the tab for which you want to modify the browser action."
+          }
+        ]
       }
     ],
     "events": [
       {
         "name": "onClicked",
         "type": "function",
         "description": "Fired when a browser action icon is clicked.  This event will not fire if the browser action has a popup.",
         "parameters": [
           {
             "name": "tab",
             "$ref": "tabs.Tab"
           }
         ]
       }
     ]
   }
 ]