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

chrome/browser/chromeos/arc/gpu_arc_video_service_host.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/arc/gpu_arc_video_service_host.h"
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 42 matching lines @@
 }
 
 void GpuArcVideoServiceHost::OnRequestArcVideoAcceleratorChannel(
     const OnRequestArcVideoAcceleratorChannelCallback& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // Hardcode pid 0 since it is unused in mojo.
   const base::ProcessHandle kUnusedChildProcessHandle =
       base::kNullProcessHandle;
   mojo::edk::PlatformChannelPair channel_pair;
+  std::string child_token = mojo::edk::GenerateRandomToken();
   mojo::edk::ChildProcessLaunched(kUnusedChildProcessHandle,
-                                  channel_pair.PassServerHandle());
+                                  channel_pair.PassServerHandle(), child_token);
 
   MojoHandle wrapped_handle;
   MojoResult wrap_result = mojo::edk::CreatePlatformHandleWrapper(
       channel_pair.PassClientHandle(), &wrapped_handle);
   if (wrap_result != MOJO_RESULT_OK) {
     LOG(ERROR) << "Pipe failed to wrap handles. Closing: " << wrap_result;
     callback.Run(mojo::ScopedHandle(), std::string());
     return;
   }
   mojo::ScopedHandle child_handle{mojo::Handle(wrapped_handle)};
 
   std::string token = mojo::edk::GenerateRandomToken();
   mojo::ScopedMessagePipeHandle server_pipe =
-      mojo::edk::CreateParentMessagePipe(token);
+      mojo::edk::CreateParentMessagePipe(token, child_token);
   if (!server_pipe.is_valid()) {
     LOG(ERROR) << "Invalid pipe";
     callback.Run(mojo::ScopedHandle(), std::string());
     return;
   }
   callback.Run(std::move(child_handle), token);
 
   content::BrowserThread::PostTask(
       content::BrowserThread::IO, FROM_HERE,
       base::Bind(
           &ConnectToVideoAcceleratorServiceOnIOThread,
           base::Passed(
               mojo::MakeRequest<::arc::mojom::VideoAcceleratorServiceClient>(
                   std::move(server_pipe)))));
 }
 
 }  // namespace arc