New custom wallpaper picker UI

chrome/common/extensions/api/wallpaper_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":"wallpaperPrivate",
     "compiler_options": {
       "implemented_in": "chrome/browser/chromeos/extensions/wallpaper_private_api.h"
     },
@@ skipping 68 matching lines @@
           {
             "type": "function",
             "name": "callback",
             "parameters": []
           }
         ]
       },
       {
         "name": "setCustomWallpaper",
         "type": "function",
-        "description": "Sets wallpaper to the image from local file with specified layout",
+        "description": "Sets wallpaper to the image from local file with specified layout and returns thumbnail if needed.",
         "nodoc": "true",
         "parameters": [
           {
             "type": "binary",
             "name": "wallpaper"
           },
           {
             "type": "string",
             "name": "layout",
             "enum": [ "STRETCH", "CENTER", "CENTER_CROPPED" ]
           },
           {
+            "type": "boolean",
+            "name": "generateThumbnail",
+            "description": "If true, callback should have a binary thumbnail."
+          },
+          {
+            "type": "string",
+            "name": "fileName"
+          },
+          {
             "type": "function",
             "name": "callback",
             "parameters": [
               {
-                "type": "string",
-                "name": "fileName"
+                "type": "binary",
+                "optional": true,
+                "name": "thumbnail"
               }
             ]
           }
         ]
       },
       {
         "name": "setCustomWallpaperLayout",
         "type": "function",
         "description": "Sets current custom wallpaper to the specified layout",
         "nodoc": "true",
@@ skipping 101 matching lines @@
                 "name": "results",
                 "items": {"type": "string"}
               }
             ]
           }
         ]
       }
     ]
   }
 ]