Connect PPAPI IPC channels for non-SFI mode.

components/nacl/loader/nacl_listener.cc

Index: components/nacl/loader/nacl_listener.cc
diff --git a/components/nacl/loader/nacl_listener.cc b/components/nacl/loader/nacl_listener.cc
index c35d946d5bbb369ac221ee5e96a359dfb93e94ff..4bafc8c093760af7badd9ba9fe07eae8e9ed6e69 100644
--- a/components/nacl/loader/nacl_listener.cc
+++ b/components/nacl/loader/nacl_listener.cc
@@ -35,6 +35,7 @@
 #if defined(OS_LINUX)
 #include "components/nacl/loader/nonsfi/nonsfi_main.h"
 #include "content/public/common/child_process_sandbox_support_linux.h"
+#include "ppapi/proxy/plugin_main_irt.h"
 #endif
 
 #if defined(OS_WIN)
@@ -279,19 +280,54 @@ void NaClListener::OnStart(const nacl::NaClStartParams& params) {
   }
 
   if (params.enable_ipc_proxy) {
-    // Create the PPAPI IPC channels between the NaCl IRT and the hosts
-    // (browser/renderer) processes. The IRT uses these channels to communicate
-    // with the host and to initialize the IPC dispatchers.
     IPC::ChannelHandle browser_handle =
         IPC::Channel::GenerateVerifiedChannelID("nacl");
-    SetUpIPCAdapter(&browser_handle, io_thread_.message_loop_proxy(),
-                    nap, NACL_CHROME_DESC_BASE);
-
     IPC::ChannelHandle renderer_handle =
         IPC::Channel::GenerateVerifiedChannelID("nacl");
-    SetUpIPCAdapter(&renderer_handle, io_thread_.message_loop_proxy(),
-                    nap, NACL_CHROME_DESC_BASE + 1);
 
+#if defined(OS_LINUX)
+    if (params.enable_nonsfi_mode) {
+      // In non-SFI mode, we neither intercept nor rewrite the message using
+      // NaClIPCAdapter, and the channels are connected between the plugin and
+      // the hosts directly. So, the IPC::Channel instances will be created in
+      // the plugin side, because the IPC::Listener needs to live on the
+      // plugin's main thread. However, on initialization (i.e. before loading
+      // the plugin binary), the FD needs to be passed to the hosts. So, here
+      // we create raw FD pairs, and pass the client side FDs to the hosts,
+      // and the server side FDs to the plugin.
+      int browser_server_ppapi_fd;
+      int browser_client_ppapi_fd;
+      int renderer_server_ppapi_fd;
+      int renderer_client_ppapi_fd;
+      if (!IPC::SocketPair(
+              &browser_server_ppapi_fd, &browser_client_ppapi_fd) ||
+          !IPC::SocketPair(
+              &renderer_server_ppapi_fd, &renderer_client_ppapi_fd)) {
+        LOG(ERROR) << "Failed to create sockets for IPC.";
+        return;
+      }
+
+      // Set the plugin IPC channel FDs.
+      SetIPCFileDescriptors(
+          browser_server_ppapi_fd, renderer_server_ppapi_fd);
+
+      // Send back to the client side IPC channel FD to the host.
+      browser_handle.socket =
+          base::FileDescriptor(browser_client_ppapi_fd, true);
+      renderer_handle.socket =
+          base::FileDescriptor(renderer_client_ppapi_fd, true);
+    } else {
+#endif
+      // Create the PPAPI IPC channels between the NaCl IRT and the host
+      // (browser/renderer) processes. The IRT uses these channels to
+      // communicate with the host and to initialize the IPC dispatchers.
+      SetUpIPCAdapter(&browser_handle, io_thread_.message_loop_proxy(),
+                      nap, NACL_CHROME_DESC_BASE);
+      SetUpIPCAdapter(&renderer_handle, io_thread_.message_loop_proxy(),
+                      nap, NACL_CHROME_DESC_BASE + 1);
+#if defined(OS_LINUX)
+    }
+#endif
     if (!Send(new NaClProcessHostMsg_PpapiChannelsCreated(
             browser_handle, renderer_handle)))
       LOG(ERROR) << "Failed to send IPC channel handle to NaClProcessHost.";