Apply default wallpaper from customization manifest.

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 2b16726abab4c0729272f942369ffd846b48eada..97d6b1288fd3a685fc63b7ba254ff5949bc2dee2 100644
--- a/chrome/browser/chromeos/login/user_image_loader.h
+++ b/chrome/browser/chromeos/login/user_image_loader.h
@@ -53,9 +53,12 @@ class UserImageLoader : public base::RefCountedThreadSafe<UserImageLoader>,
 
   // Contains attributes we need to know about each image we decode.
   struct ImageInfo {
-    ImageInfo(int size, const LoadedCallback& loaded_cb);
+    ImageInfo(const std::string& file_path,
+              int size,
+              const LoadedCallback& loaded_cb);
     ~ImageInfo();
 
+    const std::string file_path;
     const int size;
     const LoadedCallback loaded_cb;
   };
@@ -64,10 +67,9 @@ class UserImageLoader : public base::RefCountedThreadSafe<UserImageLoader>,
 
   virtual ~UserImageLoader();
 
-  // Reads the image from |filepath| and starts the decoding process. This
-  // method may only be invoked via the |background_task_runner_|.
-  void ReadAndDecodeImage(const std::string& filepath,
-                          const ImageInfo& image_info);
+  // Reads the image from |image_info.file_path| and starts the decoding
+  // process. This method may only be invoked via the |background_task_runner_|.
+  void ReadAndDecodeImage(const ImageInfo& image_info);
 
   // Decodes the image |data|. This method may only be invoked via the
   // |background_task_runner_|.