Pass the client end handle of the network-to-daemon IPC channel via handle inheritance.

remoting/host/win/unprivileged_process_delegate.h

Index: remoting/host/win/unprivileged_process_delegate.h
diff --git a/remoting/host/win/unprivileged_process_delegate.h b/remoting/host/win/unprivileged_process_delegate.h
index 0108371a8b8d8d45c085b694f3fd31641b8711d9..a8600ddb66c1ec2bf0b1b96b9027ed711ef3d774 100644
--- a/remoting/host/win/unprivileged_process_delegate.h
+++ b/remoting/host/win/unprivileged_process_delegate.h
@@ -9,12 +9,19 @@
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
+#include "base/win/scoped_handle.h"
 #include "remoting/host/win/worker_process_launcher.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 } // namespace base
 
+namespace IPC {
+class ChannelProxy;
+class Listener;
+class Message;
+} // namespace IPC
+
 namespace remoting {
 
 // Implements logic for launching and monitoring a worker process under a less
@@ -27,14 +34,27 @@ class UnprivilegedProcessDelegate : public WorkerProcessLauncher::Delegate {
       const FilePath& binary_path);
   virtual ~UnprivilegedProcessDelegate();
 
+  // IPC::Sender implementation.
+  virtual bool Send(IPC::Message* message) OVERRIDE;
+
   // WorkerProcessLauncher::Delegate implementation.
   virtual DWORD GetExitCode() OVERRIDE;
   virtual void KillProcess(DWORD exit_code) OVERRIDE;
   virtual bool LaunchProcess(
-      const std::string& channel_name,
+      IPC::Listener* delegate,
       base::win::ScopedHandle* process_exit_event_out) OVERRIDE;
 
  private:
+  // Creates an already connected IPC channel. The server end of the channel
+  // is wrapped into a channel proxy that will invoke methods of |delegate|
+  // on the |main_task_runner| thread while using |io_task_runner| to send and
+  // receive messages in the background. The client end is returned as
+  // an inheritable NT handle.
+  bool CreateConnectedIpcChannel(const std::string& channel_name,
+                                 IPC::Listener* delegate,
+                                 base::win::ScopedHandle* client_out,
+                                 scoped_ptr<IPC::ChannelProxy>* server_out);
+
   // The task runner all public methods of this class should be called on.
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 
@@ -44,6 +64,10 @@ class UnprivilegedProcessDelegate : public WorkerProcessLauncher::Delegate {
   // Path to the worker process binary.
   FilePath binary_path_;
 
+  // The server end of the IPC channel used to communicate to the worker
+  // process.
+  scoped_ptr<IPC::ChannelProxy> channel_;
+
   // The handle of the worker process, if launched.
   base::win::ScopedHandle worker_process_;