Use token-based initialisation for the utility process MojoApplication.

content/browser/mojo/mojo_application_host.h

Index: content/browser/mojo/mojo_application_host.h
diff --git a/content/browser/mojo/mojo_application_host.h b/content/browser/mojo/mojo_application_host.h
index 0d7916fe9763f85464d3b392a11e7128dda38d37..50fdfdf63fb4709259ff03046bb3cbb8fb9c6dc0 100644
--- a/content/browser/mojo/mojo_application_host.h
+++ b/content/browser/mojo/mojo_application_host.h
@@ -6,6 +6,7 @@
 #define CONTENT_BROWSER_MOJO_MOJO_APPLICATION_HOST_H_
 
 #include <memory>
+#include <string>
 
 #include "base/macros.h"
 #include "base/process/process_handle.h"
@@ -42,6 +43,10 @@ class CONTENT_EXPORT MojoApplicationHost {
   bool Init();
   void Activate(IPC::Sender* sender, base::ProcessHandle process_handle);
 
+  // Use a shared token to initialize the application. Returns a token to pass
+  // to the child process.
+  std::string InitWithToken();
+
   ServiceRegistry* service_registry() { return &service_registry_; }
 
 #if defined(OS_ANDROID)