[mojo-edk] Bind a child token to child launches and port reservations.

services/shell/runner/host/child_process_host.cc

Index: services/shell/runner/host/child_process_host.cc
diff --git a/services/shell/runner/host/child_process_host.cc b/services/shell/runner/host/child_process_host.cc
index b01ce96996e653fdb678432c1fe651380560d53b..c91f29c0abd8279d9314d376d860d550831f4a69 100644
--- a/services/shell/runner/host/child_process_host.cc
+++ b/services/shell/runner/host/child_process_host.cc
@@ -50,6 +50,7 @@ ChildProcessHost::ChildProcessHost(base::TaskRunner* launch_process_runner,
       start_sandboxed_(start_sandboxed),
       target_(target),
       app_path_(app_path),
+      child_token_(mojo::edk::GenerateRandomToken()),
       start_child_process_event_(
           base::WaitableEvent::ResetPolicy::AUTOMATIC,
           base::WaitableEvent::InitialState::NOT_SIGNALED),
@@ -98,7 +99,8 @@ mojom::ShellClientPtr ChildProcessHost::Start(
       child_command_line.get(), &handle_passing_info_);
 
   mojom::ShellClientPtr client =
-      PassShellClientRequestOnCommandLine(child_command_line.get());
+      PassShellClientRequestOnCommandLine(child_command_line.get(),
+                                          child_token_);
   launch_process_runner_->PostTaskAndReply(
       FROM_HERE,
       base::Bind(&ChildProcessHost::DoLaunch, base::Unretained(this),
@@ -202,7 +204,8 @@ void ChildProcessHost::DoLaunch(
       mojo::edk::ChildProcessLaunched(
           child_process_.Handle(),
           mojo::edk::ScopedPlatformHandle(mojo::edk::PlatformHandle(
-              mojo_ipc_channel_->PassServerHandle().release().handle)));
+              mojo_ipc_channel_->PassServerHandle().release().handle)),
+          child_token_);
     }
   }
   start_child_process_event_.Signal();