Use text input type to control visibility of virtual keyboard

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "unprivileged": true,
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
@@ skipping 3388 matching lines @@
             "type": "string",
             "name": "engineID",
             "description": "ID of the engine receiving the event"
           },
           {
             "type": "string",
             "name": "name",
             "description": "Name of the MenuItem which was activated"
           }
         ]
+      },
+      {
+        "name": "onTextInputTypeChanged",
+        "type": "function",
+        "description": "This event is sent to the virtual keyboard when the text input type is changed.",
+        "parameters": [
+          {
+            "type": "string",
+            "name": "type",
+            "enum": ["none", "text", "password", "search", "email", "number", "tel", "url"],
+            "description": "Type of the current focused input field."
+          }
+        ]
       }
     ]
   },
   {
     "namespace": "inputMethodPrivate",
     "nodoc": true,
     "platforms": ["chromeos"],
     "types": [],
     "functions": [
       {
@@ skipping 4648 matching lines @@
                 "description": "A string result code. The value is non-empty on success only in tests.",
                 "optional": "true"
               }
             ]
           }
         ]
       }
     ]
   }
 ]