Use token-based initialisation for the utility process MojoApplication.

content/child/mojo/mojo_application.cc

Index: content/child/mojo/mojo_application.cc
diff --git a/content/child/mojo/mojo_application.cc b/content/child/mojo/mojo_application.cc
index cd369d3d541e95437d3f0a4fc197adde0138ece7..0864424b94070799f4514b23e80a82fbb5bf5db7 100644
--- a/content/child/mojo/mojo_application.cc
+++ b/content/child/mojo/mojo_application.cc
@@ -12,6 +12,7 @@
 #include "content/common/mojo/channel_init.h"
 #include "content/common/mojo/mojo_messages.h"
 #include "ipc/ipc_message.h"
+#include "mojo/edk/embedder/embedder.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
 
 namespace content {
@@ -34,6 +35,23 @@ bool MojoApplication::OnMessageReceived(const IPC::Message& msg) {
   return handled;
 }
 
+void MojoApplication::InitWithToken(std::string token) {
+  mojo::ScopedMessagePipeHandle handle =
+      mojo::edk::CreateChildMessagePipe(token);
+  DCHECK(handle.is_valid());
+
+  mojom::ApplicationSetupPtr application_setup;
+  application_setup.Bind(
+      mojo::InterfacePtrInfo<mojom::ApplicationSetup>(std::move(handle), 0u));
+
+  mojo::shell::mojom::InterfaceProviderPtr services;
+  mojo::shell::mojom::InterfaceProviderPtr exposed_services;
+  service_registry_.Bind(GetProxy(&exposed_services));
+  application_setup->ExchangeInterfaceProviders(GetProxy(&services),
+                                                std::move(exposed_services));
+  service_registry_.BindRemoteServiceProvider(std::move(services));
+}
+
 void MojoApplication::OnActivate(
     const IPC::PlatformFileForTransit& file) {
 #if defined(OS_POSIX)