Enable robust decoding of custom wallpaper and allow custom wallpaper on login page

chrome/browser/chromeos/login/user_image_loader.h

Index: chrome/browser/chromeos/login/user_image_loader.h
diff --git a/chrome/browser/chromeos/login/user_image_loader.h b/chrome/browser/chromeos/login/user_image_loader.h
index 01b55fd2714eac5ed8574344ef00879cc1bc5c68..a5a8b4589c29016c79a2a2b9351f7516f923e010 100644
--- a/chrome/browser/chromeos/login/user_image_loader.h
+++ b/chrome/browser/chromeos/login/user_image_loader.h
@@ -28,7 +28,7 @@ class UserImageLoader : public base::RefCountedThreadSafe<UserImageLoader>,
   // Callback used to indicate that image has been loaded.
   typedef base::Callback<void(const UserImage& user_image)> LoadedCallback;
 
-  UserImageLoader();
+  explicit UserImageLoader(ImageDecoder::ImageCodec image_codec);
 
   // Start reading the image from |filepath| on the file thread. Calls
   // |loaded_cb| when image has been successfully loaded.
@@ -65,6 +65,9 @@ class UserImageLoader : public base::RefCountedThreadSafe<UserImageLoader>,
   // The message loop object of the thread in which we notify the delegate.
   MessageLoop* target_message_loop_;
 
+  // Specify how the file should be decoded in the utility process.
+  const ImageDecoder::ImageCodec image_codec_;
+
   // Holds info structures about all images we're trying to decode.
   // Accessed only on FILE thread.
   ImageInfoMap image_info_map_;