Add delete context menu for custom wallpapers and some ui tweaks

chrome/browser/chromeos/extensions/wallpaper_private_api.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 CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_PRIVATE_API_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_PRIVATE_API_H_
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/chromeos/login/user.h"
@@ skipping 119 matching lines @@
   std::string url_;
 
   // String representation of downloaded wallpaper.
   std::string image_data_;
 
   // Sequence token associated with wallpaper operations. Shared with
   // WallpaperManager.
   base::SequencedWorkerPool::SequenceToken sequence_token_;
 };
 
+class WallpaperPrivateResetWallpaperFunction
+    : public AsyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("wallpaperPrivate.resetWallpaper",
+                             WALLPAPERPRIVATE_RESETWALLPAPER)
+
+  WallpaperPrivateResetWallpaperFunction();
+
+ protected:
+  virtual ~WallpaperPrivateResetWallpaperFunction();
+
+  // AsyncExtensionFunction overrides.
+  virtual bool RunImpl() OVERRIDE;
+};
+
 class WallpaperPrivateSetCustomWallpaperFunction
     : public WallpaperFunctionBase {
  public:
   DECLARE_EXTENSION_FUNCTION("wallpaperPrivate.setCustomWallpaper",
                              WALLPAPERPRIVATE_SETCUSTOMWALLPAPER)
 
   WallpaperPrivateSetCustomWallpaperFunction();
 
  protected:
   virtual ~WallpaperPrivateSetCustomWallpaperFunction();
@@ skipping 158 matching lines @@
   // Sends the list of files to extension api caller. If no files or no
   // directory, sends empty list.
   void OnComplete(const std::vector<std::string>& file_list);
 
   // Sequence token associated with wallpaper operations. Shared with
   // WallpaperManager.
   base::SequencedWorkerPool::SequenceToken sequence_token_;
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_PRIVATE_API_H_