Use a #fefefe solid color wallpaper background before user login for GAIA login flow

ash/desktop_background/desktop_background_controller.h

 // 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.
 
 #ifndef ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
 #define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "ash/desktop_background/desktop_background_resources.h"
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
+#include "third_party/skia/include/core/SkColor.h"
 
 namespace aura {
 class RootWindow;
 }
 
 namespace gfx {
 class ImageSkia;
 }
 
 namespace ash {
 
 class UserWallpaperDelegate {
  public:
   virtual ~UserWallpaperDelegate() {}
 
-  // Loads logged in user wallpaper asynchronously and sets to current wallpaper
-  // after loaded.
-  virtual void SetLoggedInUserWallpaper() = 0;
+  // Initialize wallpaper.
+  virtual void InitializeWallpaper() = 0;
 
   // Opens the set wallpaper page in the browser.
   virtual void OpenSetWallpaperPage() = 0;
 
   // Returns true if user can open set wallpaper page. Only guest user returns
   // false currently.
   virtual bool CanOpenSetWallpaperPage() = 0;
 };
 
 // Loads selected desktop wallpaper from file system asynchronously and updates
@@ skipping 18 matching lines @@
   void SetDefaultWallpaper(int index);
 
   // Sets the user selected custom wallpaper. Called when user selected a file
   // from file system or changed the layout of wallpaper.
   void SetCustomWallpaper(const gfx::ImageSkia& wallpaper,
                           WallpaperLayout layout);
 
   // Cancels the current wallpaper loading operation.
   void CancelPendingWallpaperOperation();
 
-  // Sets the desktop background to solid color mode and creates a solid color
-  // layout.
-  void SetDesktopBackgroundSolidColorMode();
+  // Sets the desktop background to solid color mode and creates a solid
+  // |color| layout.
+  void SetDesktopBackgroundSolidColorMode(SkColor color);
 
   // Creates an empty wallpaper. Some tests require a wallpaper widget is ready
   // when running. However, the wallpaper widgets are now created asynchronously
   // . If loading a real wallpaper, there are cases that these tests crash
   // because the required widget is not ready. This function synchronously
   // creates an empty widget for those tests to prevent crashes. An example test
   // is SystemGestureEventFilterTest.ThreeFingerSwipe.
   void CreateEmptyWallpaper();
 
  private:
@@ skipping 20 matching lines @@
   scoped_refptr<WallpaperOperation> wallpaper_op_;
 
   base::WeakPtrFactory<DesktopBackgroundController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_