Resize and save custom wallpaper to large and small size

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
index 83b486c4808ea4692a786d0f352ccc178be46ea8..a48f9dc1c5df47ca6d86c95d24470be9cf91022e 100644
--- a/ash/desktop_background/desktop_background_controller.cc
+++ b/ash/desktop_background/desktop_background_controller.cc
@@ -26,8 +26,6 @@
 namespace ash {
 namespace {
 
-const int kSmallWallpaperMaximalWidth = 1366;
-const int kSmallWallpaperMaximalHeight = 800;
 const SkColor kTransparentColor = SkColorSetARGB(0x00, 0x00, 0x00, 0x00);
 
 internal::RootWindowLayoutManager* GetRootWindowLayoutManager(
@@ -37,6 +35,11 @@ internal::RootWindowLayoutManager* GetRootWindowLayoutManager(
 }
 }  // namespace
 
+const int kSmallWallpaperMaximalWidth = 1366;
+const int kSmallWallpaperMaximalHeight = 800;
+const int kLargeWallpaperMaximalWidth = 2560;
+const int kLargeWallpaperMaximalHeight = 1700;
+
 // Stores the current wallpaper data.
 struct DesktopBackgroundController::WallpaperData {
   WallpaperData(int index, WallpaperResolution resolution)