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

chrome/nacl/nacl_ipc_adapter.cc

Index: chrome/nacl/nacl_ipc_adapter.cc
===================================================================
--- chrome/nacl/nacl_ipc_adapter.cc	(revision 143037)
+++ chrome/nacl/nacl_ipc_adapter.cc	(working copy)
@@ -74,6 +74,7 @@
                               int /* flags */) {
   if (msg->iov_length != 1)
     return -1;
+  msg->ndesc_length = 0;  // Messages with handles aren't supported yet.

[Mark Seaborn, 2012/06/20 19:24:40]

Nit: "descriptors" is the proper term in this context, not "handles" (which is a
Windows-specific term).

[bbudge, 2012/06/21 00:00:46]

Done.

   return static_cast<ssize_t>(
       ToAdapter(handle)->BlockingReceive(static_cast<char*>(msg->iov[0].base),
                                          msg->iov[0].length));
@@ -281,6 +282,12 @@
   return MakeNaClDescCustom(this);
 }
 
+#if defined(OS_POSIX)
+int NaClIPCAdapter::TakeClientFileDescriptor() {
+  return io_thread_data_.channel_->TakeClientFileDescriptor();
+}
+#endif
+
 bool NaClIPCAdapter::OnMessageReceived(const IPC::Message& message) {
   {
     base::AutoLock lock(lock_);