Adds ability for chrome to behave as mojo_runner

mojo/shell/native_runner.h

Index: mojo/shell/native_runner.h
diff --git a/mojo/shell/native_runner.h b/mojo/shell/native_runner.h
index 6ab587b4f449f3b84f1672434d40e3e1e9ae0c43..f2d4bc613348f06bac151bac66faa68ad14d639f 100644
--- a/mojo/shell/native_runner.h
+++ b/mojo/shell/native_runner.h
@@ -22,6 +22,8 @@ class FilePath;
 namespace mojo {
 namespace shell {
 
+class Identity;
+
 // ApplicationManager requires implementations of NativeRunner and
 // NativeRunnerFactory to run native applications.
 class NativeRunner {
@@ -32,6 +34,7 @@ class NativeRunner {
   // thread/process.
   virtual void Start(
       const base::FilePath& app_path,
+      const Identity& target,
       bool start_sandboxed,
       InterfaceRequest<mojom::ShellClient> request,
       const base::Callback<void(base::ProcessId)>& pid_available_callback,