Hook up Chrome's wallpaper picker for mash.

ash/mus/sysui_application.h

Index: ash/mus/sysui_application.h
diff --git a/ash/mus/sysui_application.h b/ash/mus/sysui_application.h
index 4e8afcee7dca69a0601bf8dbe6e88d3ec96e08dd..8ce34b31f1586b29d72d262b438ef0ccd4ebc372 100644
--- a/ash/mus/sysui_application.h
+++ b/ash/mus/sysui_application.h
@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "base/macros.h"
+#include "mash/public/interfaces/wallpaper.mojom.h"
 #include "mash/shelf/public/interfaces/shelf.mojom.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/shell/public/cpp/shell_client.h"
@@ -20,7 +21,8 @@ class AshInit;
 
 class SysUIApplication
     : public shell::ShellClient,
-      public shell::InterfaceFactory<mash::shelf::mojom::ShelfController> {
+      public shell::InterfaceFactory<mash::shelf::mojom::ShelfController>,
+      public shell::InterfaceFactory<mash::mojom::WallpaperController> {
  public:
   SysUIApplication();
   ~SysUIApplication() override;
@@ -34,14 +36,19 @@ class SysUIApplication
 
   // InterfaceFactory<mash::shelf::mojom::ShelfController>:
   void Create(shell::Connection* connection,
-              mojo::InterfaceRequest<mash::shelf::mojom::ShelfController>
-                  request) override;
+              mash::shelf::mojom::ShelfControllerRequest request) override;
+
+  // InterfaceFactory<mash::mojom::WallpaperController>:
+  void Create(shell::Connection* connection,
+              mash::mojom::WallpaperControllerRequest request) override;
 
   mojo::TracingImpl tracing_;
   std::unique_ptr<AshInit> ash_init_;
 
   mojo::BindingSet<mash::shelf::mojom::ShelfController>
       shelf_controller_bindings_;
+  mojo::BindingSet<mash::mojom::WallpaperController>
+      wallpaper_controller_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(SysUIApplication);
 };