linux (and some posix): multiprocess plugins compiling.

chrome/browser/plugin_process_host.cc

 // Copyright (c) 2006-2008 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/plugin_process_host.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 372 matching lines @@
 
   cmd_line.AppendSwitchWithValue(switches::kProcessChannelID, channel_id());
 
   cmd_line.AppendSwitchWithValue(switches::kPluginPath,
                                  info.path.ToWStringHack());
 
   base::ProcessHandle process = 0;
 #if defined(OS_WIN)
   process = sandbox::StartProcess(&cmd_line);
 #else
-  // spawn child process
-  base::LaunchApp(cmd_line, false, false, &process);
+  // This code is duplicated with browser_render_process_host.cc, but
+  // there's not a good place to de-duplicate it.
+  base::file_handle_mapping_vector fds_to_map;
+  int src_fd = -1, dest_fd = -1;
+  channel().GetClientFileDescriptorMapping(&src_fd, &dest_fd);
+  if (src_fd > -1)
+    fds_to_map.push_back(std::pair<int, int>(src_fd, dest_fd));
+  base::LaunchApp(cmd_line.argv(), fds_to_map, false, &process);
 #endif
 
   if (!process)
     return false;
   SetHandle(process);
 
   FilePath gears_path;
   if (PathService::Get(chrome::FILE_GEARS_PLUGIN, &gears_path)) {
     FilePath::StringType gears_path_lc = StringToLowerASCII(gears_path.value());
     FilePath::StringType plugin_path_lc =
@@ skipping 158 matching lines @@
   DCHECK(MessageLoop::current() ==
          ChromeThread::GetMessageLoop(ChromeThread::IO));
 
   ChromePluginLib *chrome_plugin = ChromePluginLib::Find(info_.path);
   if (chrome_plugin) {
     void *data_ptr = const_cast<void*>(reinterpret_cast<const void*>(&data[0]));
     uint32 data_len = static_cast<uint32>(data.size());
     chrome_plugin->functions().on_message(data_ptr, data_len);
   }
 }