Removes the restriction of onFocus event on password field to 3rd party IMEs.

chrome/common/extensions/api/input_ime.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": "input.ime",
     "description": "Use the <code>chrome.input.ime</code> API to implement a custom IME for Chrome OS. This allows your extension to handle keystrokes, set the composition, and manage the candidate window.",
     "platforms": ["chromeos"],
     "types": [
@@ skipping 12 matching lines @@
           "shiftKey": {"type": "boolean", "optional": true, "description": "Whether or not the SHIFT key is pressed."},
           "capsLock": {"type": "boolean", "optional": true, "description": "Whether or not the CAPS_LOCK is enabled."}
         }
       },
       {
         "id": "InputContext",
         "type": "object",
         "description": "Describes an input Context",
         "properties": {
           "contextID": {"type": "integer", "description": "This is used to specify targets of text field operations.  This ID becomes invalid as soon as onBlur is called."},
-          "type": {"type": "string", "description": "Type of value this text field edits, (Text, Number, URL, etc)", "enum": ["text", "search", "tel", "url", "email", "number"]}
+          "type": {"type": "string", "description": "Type of value this text field edits, (Text, Number, URL, etc)", "enum": ["text", "search", "tel", "url", "email", "number", "password"]}
         }
       },
       {
         "id": "MenuItem",
         "type": "object",
         "description": "A menu item used by an input method to interact with the user from the language menu.",
         "properties": {
           "id": {"type": "string", "description": "String that will be passed to callbacks referencing this MenuItem."},
           "label": {"type": "string", "optional": true, "description": "Text displayed in the menu for this item."},
           "style": {
@@ skipping 622 matching lines @@
           {
             "type": "string",
             "name": "engineID",
             "description": "ID of the engine receiving the event"
           }
         ]
       }
     ]
   }
 ]