Add an IPC channel between the NaCl loader process and the renderer.

ppapi/c/private/ppb_nacl_private.h

 // Copyright (c) 2012 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.
 
 #ifndef PPAPI_C_PRIVATE_PPB_NACL_UTIL_PRIVATE_H_
 #define PPAPI_C_PRIVATE_PPB_NACL_UTIL_PRIVATE_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
 
 #define PPB_NACL_PRIVATE_INTERFACE "PPB_NaCl(Private);0.5"
 
 struct PPB_NaCl_Private {
   // This function launches NaCl's sel_ldr process.  On success, the function
   // returns true, otherwise it returns false.  When it returns true, it will
-  // write |socket_count| nacl::Handles to imc_handles.  Unless
+  // write |socket_count| nacl::Handles to imc_handles. |ipc_channel_handle|
+  // will point to information needed to start the IPC proxy.  Unless
   // EnableBackgroundSelLdrLaunch is called, this method must be invoked from
   // the main thread.
   PP_Bool (*LaunchSelLdr)(PP_Instance instance,
                           const char* alleged_url,
                           int socket_count,
-                          void* imc_handles);
+                          void* imc_handles,
+                          void** ipc_channel_handle);
 
   // This function starts the PPAPI proxy so the nexe can communicate with the
-  // browser's renderer process.
-  PP_Bool (*StartPpapiProxy)(PP_Instance instance);
+  // browser's renderer process. |ipc_channel_handle| is the pointer returned
+  // by the call to LaunchSelLdr.
+  PP_Bool (*StartPpapiProxy)(PP_Instance instance,
+                             void* ipc_channel_handle);
 
   // On POSIX systems, this function returns the file descriptor of
   // /dev/urandom.  On non-POSIX systems, this function returns 0.
   int (*UrandomFD)(void);
 
   // Whether the Pepper 3D interfaces should be disabled in the NaCl PPAPI
   // proxy. This is so paranoid admins can effectively prevent untrusted shader
   // code to be processed by the graphics stack.
   bool (*Are3DInterfacesDisabled)();
 
@@ skipping 11 matching lines @@
   // usable with NaClSetBrokerDuplicateHandleFunc() without further
   // wrapping.
   int (*BrokerDuplicateHandle)(void* source_handle,
                                uint32_t process_id,
                                void** target_handle,
                                uint32_t desired_access,
                                uint32_t options);
 };
 
 #endif  // PPAPI_C_PRIVATE_PPB_NACL_PRIVATE_H_