Add a iconUrl parameter to webstorePrivate.beginInstallWithManifest2

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 7215 matching lines @@
                 "type": "string",
                 "description": "The id of the extension to be installled.",
                 "minLength": 32,
                 "maxLength": 32
               },
               "manifest": {
                 "type": "string",
                 "description": "A string with the contents of the extension's manifest.json file. During the install process, the browser will check that the downloaded extension's manifest matches what was passed in here.",
                 "minLength": 1
               },
+              "iconUrl": {
+                "type": "string",
+                "optional": true,
+                "desciption": "A URL for the image to display in the confirmation dialog"
+              },
               "iconData": {
                 "type": "string",
                 "optional": true,
                 "description": "An icon as a base64-encoded image, displayed in a confirmation dialog."
               },
               "localizedName": {
                 "type": "string",
                 "optional": true,
                 "description": "A string to use instead of the raw value of the 'name' key from manifest.json."
               },
@@ skipping 11 matching lines @@
           },
           {
             "name": "callback",
             "type": "function",
             "description": "Called when the user has either accepted/rejected the dialog, or some error occurred (such as invalid manifest or icon image data).",
             "optional": "true",
             "parameters": [
               {
                 "name": "result",
                 "type": "string",
-                "description": "A string result code, which will be empty upon success. The possible values in the case of errors include 'unknown_error', 'user_cancelled', 'manifest_error', 'icon_error', 'invalid_id', 'permission_denied', and 'no_gesture'."
+                "description": "A string result code, which will be empty upon success. The possible values in the case of errors include 'unknown_error', 'user_cancelled', 'manifest_error', 'icon_error', 'invalid_id', 'permission_denied', 'no_gesture', and 'invalid_icon_url'."
               }
             ]
           }
         ]
 
       },
       {
         "name": "completeInstall",
         "description": "",
         "parameters": [
@@ skipping 802 matching lines @@
                 "description": "A string result code. The value is non-empty on success only in tests.",
                 "optional": "true"
               }
             ]
           }
         ]
       }
     ]
   }
 ]