Enable user change background image in settings page in Aura build.

ash/desktop_background/desktop_background_controller.cc

Index: ash/desktop_background/desktop_background_controller.cc
diff --git a/ash/desktop_background/desktop_background_controller.cc b/ash/desktop_background/desktop_background_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ad3da7c0f67861c285853146bb2ba174ac1e9d41
--- /dev/null
+++ b/ash/desktop_background/desktop_background_controller.cc
@@ -0,0 +1,64 @@
+// 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_controller.h"
+#include "ash/desktop_background/desktop_background_view.h"
+#include "base/logging.h"
+#include "ui/gfx/image/image.h"
+#include "grit/ui_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+
+namespace ash {
+
+const int kDefaultWallpaperResources[] = {
+  IDR_AURA_WALLPAPER_1,
+  IDR_AURA_WALLPAPER_2,
+  IDR_AURA_WALLPAPER_3,
+  IDR_AURA_WALLPAPER_4,
+  IDR_AURA_WALLPAPER_5,
+  IDR_AURA_WALLPAPER_6,
+  IDR_AURA_WALLPAPER_7,
+  IDR_AURA_WALLPAPER_8,
+  IDR_AURA_WALLPAPER_9,
+};
+
+const int kDefaultWallpaperResourcesThumb[] = {
+  IDR_AURA_WALLPAPER_1_THUMB,
+  IDR_AURA_WALLPAPER_2_THUMB,
+  IDR_AURA_WALLPAPER_3_THUMB,
+  IDR_AURA_WALLPAPER_4_THUMB,
+  IDR_AURA_WALLPAPER_5_THUMB,
+  IDR_AURA_WALLPAPER_6_THUMB,
+  IDR_AURA_WALLPAPER_7_THUMB,
+  IDR_AURA_WALLPAPER_8_THUMB,
+  IDR_AURA_WALLPAPER_9_THUMB,
+};
+
+const int kDefaultWallpaperCount = arraysize(kDefaultWallpaperResources);
+
+const SkBitmap& GetDefaultWallpaper(int index) {
+  DCHECK(index >= 0 && index < kDefaultWallpaperCount);
+  return *ui::ResourceBundle::GetSharedInstance().GetImageNamed(
+      kDefaultWallpaperResources[index]).ToSkBitmap();
+}
+
+const SkBitmap& GetDefaultWallpaperThumbnail(int index) {
+  DCHECK(index >= 0 && index < kDefaultWallpaperCount);
+  return *ui::ResourceBundle::GetSharedInstance().GetImageNamed(
+      kDefaultWallpaperResourcesThumb[index]).ToSkBitmap();
+}
+
+DesktopBackgroundController::DesktopBackgroundController(){
+}
+
+DesktopBackgroundController::~DesktopBackgroundController() {
+}
+
+void DesktopBackgroundController::OnDesktopBackgroundChange(int index) {
+  DCHECK(index >=0 && index < kDefaultWallpaperCount);
+  internal::DesktopBackgroundView::GetInstance()->SetWallpaper(
+      GetDefaultWallpaper(index));
+}
+
+}  // namespace ash