Add an option to disable NaCl at compile time for platforms where it doesn't build yet

chrome/browser/nacl_process_host.cc

 // Copyright (c) 2009 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 "build/build_config.h"
 
 #include "chrome/browser/nacl_process_host.h"
 
 #if defined(OS_POSIX)
 #include <fcntl.h>
@@ skipping 21 matching lines @@
 
 NaClProcessHost::NaClProcessHost(
     ResourceDispatcherHost *resource_dispatcher_host)
     : ChildProcessHost(NACL_PROCESS, resource_dispatcher_host),
       resource_dispatcher_host_(resource_dispatcher_host) {
 }
 
 bool NaClProcessHost::Launch(ResourceMessageFilter* renderer_msg_filter,
                              const int descriptor,
                              nacl::FileDescriptor* handle) {
+#ifdef DISABLE_NACL
+  NOTIMPLEMENTED() << "Native Client disabled at build time";
+  return false;
+#else
   nacl::Handle pair[2];
   bool success = false;
   // Create a connected socket
   if (nacl::SocketPair(pair) == -1) {
     NATIVE_HANDLE(*handle) = nacl::kInvalidHandle;
     return false;
   }
 
   // Launch the process
   success = LaunchSelLdr(renderer_msg_filter, descriptor, pair[1]);
@@ skipping 21 matching lines @@
     flags |= FD_CLOEXEC;
     fcntl(duplicate_handle, F_SETFD, flags);
   }
   // No need to dup the handle - we don't pass it anywhere else so
   // it cannot be closed.
   handle->fd = duplicate_handle;
   handle->auto_close = true;
 #endif
 
   return true;
+#endif  // DISABLE_NACL
 }
 
 bool NaClProcessHost::LaunchSelLdr(ResourceMessageFilter* renderer_msg_filter,
                                    const int descriptor,
                                    const nacl::Handle handle) {
   if (!CreateChannel())
     return false;
 
   // Build command line for nacl.
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
@@ skipping 84 matching lines @@
 
 void NaClProcessHost::OnMessageReceived(const IPC::Message& msg) {
   NOTREACHED() << "Invalid message with type = " << msg.type();
 }
 
 URLRequestContext* NaClProcessHost::GetRequestContext(
     uint32 request_id,
     const ViewHostMsg_Resource_Request& request_data) {
   return NULL;
 }
-