Hook up Chrome's wallpaper picker for mash.

chrome/browser/ui/ash/chrome_wallpaper_manager.h

Index: chrome/browser/ui/ash/chrome_wallpaper_manager.h
diff --git a/chrome/browser/ui/ash/chrome_wallpaper_manager.h b/chrome/browser/ui/ash/chrome_wallpaper_manager.h
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+++ b/chrome/browser/ui/ash/chrome_wallpaper_manager.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_MANAGER_H_
+#define CHROME_BROWSER_UI_ASH_CHROME_WALLPAPER_MANAGER_H_
+
+#include "ash/mus/public/interfaces/wallpaper.mojom.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
+
+// ChromeWallpaperManager exposes chrome wallpaper functionality to ash_sysui.
+class ChromeWallpaperManager : public ash::mus::mojom::WallpaperManager {
+ public:
+  ChromeWallpaperManager();
+  ~ChromeWallpaperManager() override;
+
+  void ProcessRequest(ash::mus::mojom::WallpaperManagerRequest request);
+
+ private:
+  // ash::mus::mojom::WallpaperManager:
+  void OpenWallpaperManager() override;
+
+  mojo::BindingSet<ash::mus::mojom::WallpaperManager> bindings_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeWallpaperManager);
+};
+
+#endif  // CHROME_BROWSER_UI_ASH_CHROME_WALLPAPER_MANAGER_H_