Add basic Chrome interaction with the mash shelf.

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 dba0f5e3dc28d611a985b4767c302f017fa3b96b..94ce312e379327674d5dfd590862e487060a9ac3 100644
--- a/ash/mus/sysui_application.h
+++ b/ash/mus/sysui_application.h
@@ -7,6 +7,8 @@
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
+#include "mash/shelf/public/interfaces/shelf.mojom.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
 #include "mojo/services/tracing/public/cpp/tracing_impl.h"
 #include "mojo/shell/public/cpp/shell_client.h"
 
@@ -15,7 +17,9 @@ namespace sysui {
 
 class AshInit;
 
-class SysUIApplication : public mojo::ShellClient {
+class SysUIApplication
+    : public mojo::ShellClient,
+      public mojo::InterfaceFactory<mash::shelf::mojom::Shelf> {
  public:
   SysUIApplication();
   ~SysUIApplication() override;
@@ -27,9 +31,16 @@ class SysUIApplication : public mojo::ShellClient {
                   uint32_t id) override;
   bool AcceptConnection(mojo::Connection* connection) override;
 
+  // InterfaceFactory<mash::shelf::mojom::Shelf>:
+  void Create(
+      mojo::Connection* connection,
+      mojo::InterfaceRequest<mash::shelf::mojom::Shelf> request) override;
+
   mojo::TracingImpl tracing_;
   scoped_ptr<AshInit> ash_init_;
 
+  mojo::BindingSet<mash::shelf::mojom::Shelf> shelf_bindings_;
+
   DISALLOW_COPY_AND_ASSIGN(SysUIApplication);
 };