Move registration of Java mojo interfaces to the new InterfaceRegistrar.

services/shell/public/cpp/interface_provider.h

Index: services/shell/public/cpp/interface_provider.h
diff --git a/services/shell/public/cpp/interface_provider.h b/services/shell/public/cpp/interface_provider.h
index 5cf1d95ace4480664869c0d74602c80842f9af64..01c3c8ca449969484961b9e371fb40637ede58e1 100644
--- a/services/shell/public/cpp/interface_provider.h
+++ b/services/shell/public/cpp/interface_provider.h
@@ -5,6 +5,7 @@
 #ifndef SERVICES_SHELL_PUBLIC_CPP_INTERFACE_PROVIDER_H_
 #define SERVICES_SHELL_PUBLIC_CPP_INTERFACE_PROVIDER_H_
 
+#include "base/bind.h"
 #include "services/shell/public/interfaces/interface_provider.mojom.h"
 
 namespace shell {
@@ -79,6 +80,19 @@ class InterfaceProvider {
   void GetInterface(const std::string& name,
                     mojo::ScopedMessagePipeHandle request_handle);
 
+  // Returns a callback to GetInterface<Interface>(). This can be passed to
+  // InterfaceRegistry::AddInterface() to forward requests.
+  template <typename Interface>
+  base::Callback<void(mojo::InterfaceRequest<Interface>)>
+  CreateInterfaceFactory() {
+    // InterfaceProvider::GetInterface() is overloaded, so static_cast to select
+    // the overload that takes an mojo::InterfaceRequest<Interface>.
+    return base::Bind(static_cast<void (InterfaceProvider::*)(
+                          mojo::InterfaceRequest<Interface>)>(
+                          &InterfaceProvider::GetInterface<Interface>),
+                      GetWeakPtr());
+  }
+
  private:
   void SetBinderForName(
       const std::string& name,