Switching back the backgroung to JPG.

ash/desktop_background/desktop_background_view.cc

 // 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.
 
 #include "ash/desktop_background/desktop_background_view.h"
 
 #include <limits>
 
 #include "ash/ash_export.h"
 #include "ash/shell.h"
@@ skipping 12 matching lines @@
 // For our scaling ratios we need to round positive numbers.
 static int RoundPositive(double x) {
   return static_cast<int>(floor(x + 0.5));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopBackgroundView, public:
 
 DesktopBackgroundView::DesktopBackgroundView() {
   wallpaper_ = *ui::ResourceBundle::GetSharedInstance().GetImageNamed(
-      IDR_AURA_WALLPAPER).ToSkBitmap();
+      IDR_AURA_WALLPAPER_1).ToSkBitmap();
   wallpaper_.buildMipMap(false);
 }
 
 DesktopBackgroundView::~DesktopBackgroundView() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopBackgroundView, views::View overrides:
 
 void DesktopBackgroundView::OnPaint(gfx::Canvas* canvas) {
@@ skipping 20 matching lines @@
       cropped_size = gfx::Size(wallpaper_.width(),
           RoundPositive(static_cast<double>(height()) / horizontal_ratio));
     }
 
     gfx::Rect wallpaper_cropped_rect = wallpaper_rect.Center(cropped_size);
     canvas->DrawBitmapInt(wallpaper_,
        wallpaper_cropped_rect.x(), wallpaper_cropped_rect.y(),
        wallpaper_cropped_rect.width(), wallpaper_cropped_rect.height(),
        0, 0, width(), height(),
        true);
-  }
-  else {
+  } else {
     // Center the wallpaper in the destination rectangle (Skia will crop
     // as needed). We might decide later to tile small solid color images.
     canvas->DrawBitmapInt(wallpaper_, (width() - wallpaper_.width()) / 2,
         (height() - wallpaper_.height()) / 2);
   }
 }
 
 bool DesktopBackgroundView::OnMousePressed(const views::MouseEvent& event) {
   return true;
 }
@@ skipping 14 matching lines @@
           ash::internal::kShellWindowId_DesktopBackgroundContainer);
   desktop_widget->Init(params);
   desktop_widget->SetContentsView(view);
   desktop_widget->Show();
   desktop_widget->GetNativeView()->SetName("DesktopBackgroundView");
   return desktop_widget;
 }
 
 }  // namespace internal
 }  // namespace ash