Hook up Chrome's wallpaper picker for mash.

chrome/browser/ui/ash/chrome_wallpaper_helper.h

Index: chrome/browser/ui/ash/chrome_wallpaper_helper.h
diff --git a/chrome/browser/ui/ash/chrome_wallpaper_helper.h b/chrome/browser/ui/ash/chrome_wallpaper_helper.h
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+// Copyright 2016 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_UI_ASH_CHROME_WALLPAPER_HELPER_H_
+#define CHROME_BROWSER_UI_ASH_CHROME_WALLPAPER_HELPER_H_
+
+#include "mash/public/interfaces/wallpaper.mojom.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
+
+// ChromeWallpaperHelper exposes wallpaper extension functionality to mash.
+class ChromeWallpaperHelper : public mash::mojom::WallpaperHelper {
+ public:
+  ChromeWallpaperHelper();
+  ~ChromeWallpaperHelper() override;
+
+  void ProcessRequest(mash::mojom::WallpaperHelperRequest request);
+
+ private:
+  // mash::mojom::WallpaperHelper:
+  void OpenWallpaperManager() override;
+
+  mojo::BindingSet<mash::mojom::WallpaperHelper> bindings_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeWallpaperHelper);
+};
+
+#endif  // CHROME_BROWSER_UI_ASH_CHROME_WALLPAPER_HELPER_H_