Apply default wallpaper from customization manifest.

ash/desktop_background/wallpaper_resizer.cc

 // Copyright (c) 2013 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.
 
 #include "ash/desktop_background/wallpaper_resizer.h"
 
 #include "ash/desktop_background/wallpaper_resizer_observer.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 66 matching lines @@
                 static_cast<double>(new_height) / horizontal_ratio));
           }
           wallpaper_rect.ClampToCenteredSize(cropped_size);
           SkBitmap sub_image;
           orig_bitmap.extractSubset(&sub_image,
                                     gfx::RectToSkIRect(wallpaper_rect));
           new_bitmap = skia::ImageOperations::Resize(
               sub_image, skia::ImageOperations::RESIZE_LANCZOS3,
               new_width, new_height);
         }
+        break;
+      case WALLPAPER_LAYOUT_UNKNOWN:
+        NOTREACHED();
     }
   }
 
   *resized_bitmap_out = new_bitmap;
   resized_bitmap_out->setImmutable();
 }
 
 }  // namespace
 
-const int kInvalidResourceID = -1;
-
 // static
 uint32_t WallpaperResizer::GetImageId(const gfx::ImageSkia& image) {
   const gfx::ImageSkiaRep& image_rep = image.GetRepresentation(1.0f);
   return image_rep.is_null() ? 0 : image_rep.sk_bitmap().getGenerationID();
 }
 
 WallpaperResizer::WallpaperResizer(int image_resource_id,
                                    const gfx::Size& target_size,
                                    WallpaperLayout layout)
     : image_(*(ui::ResourceBundle::GetSharedInstance()
@@ skipping 46 matching lines @@
 }
 
 void WallpaperResizer::OnResizeFinished(SkBitmap* resized_bitmap) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   image_ = gfx::ImageSkia::CreateFrom1xBitmap(*resized_bitmap);
   FOR_EACH_OBSERVER(WallpaperResizerObserver, observers_,
                     OnWallpaperResized());
 }
 
 } // namespace ash