Use ChannelMojo in Pepper and NaCl processes.

ppapi/nacl_irt/plugin_startup.cc

Index: ppapi/nacl_irt/plugin_startup.cc
diff --git a/ppapi/nacl_irt/plugin_startup.cc b/ppapi/nacl_irt/plugin_startup.cc
index 338f524608f767035087d3c207e8445fdc32d1da..1026efd5339bddc0a7a13ba549bbf3fbacb3a04b 100644
--- a/ppapi/nacl_irt/plugin_startup.cc
+++ b/ppapi/nacl_irt/plugin_startup.cc
@@ -12,6 +12,8 @@
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "ipc/ipc_channel_handle.h"
+#include "ipc/mojo/scoped_ipc_support.h"
+#include "mojo/edk/embedder/embedder.h"
 #include "ppapi/nacl_irt/manifest_service.h"
 #include "ppapi/shared_impl/ppb_audio_shared.h"
 
@@ -21,6 +23,7 @@ namespace {
 int g_nacl_browser_ipc_fd = -1;
 int g_nacl_renderer_ipc_fd = -1;
 int g_manifest_service_fd = -1;
+int g_nacl_browser_mojo_fd = -1;
 
 base::WaitableEvent* g_shutdown_event = NULL;
 base::Thread* g_io_thread = NULL;
@@ -48,14 +51,17 @@ void StartUpManifestServiceOnIOThread(base::WaitableEvent* event) {
 }  // namespace
 
 void SetIPCFileDescriptors(
-    int browser_ipc_fd, int renderer_ipc_fd, int manifest_service_fd) {
+    int browser_ipc_fd, int renderer_ipc_fd, int manifest_service_fd,
+    int browser_mojo_fd) {
   // The initialization must be only once.
   DCHECK_EQ(g_nacl_browser_ipc_fd, -1);
   DCHECK_EQ(g_nacl_renderer_ipc_fd, -1);
   DCHECK_EQ(g_manifest_service_fd, -1);
+  DCHECK_EQ(g_nacl_browser_mojo_fd, -1);
   g_nacl_browser_ipc_fd = browser_ipc_fd;
   g_nacl_renderer_ipc_fd = renderer_ipc_fd;
   g_manifest_service_fd = manifest_service_fd;
+  g_nacl_browser_mojo_fd = browser_mojo_fd;
 }
 
 void StartUpPlugin() {
@@ -68,6 +74,15 @@ void StartUpPlugin() {
   g_io_thread->StartWithOptions(
       base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
 
+  // Initialize Mojo.
+  mojo::edk::Init();
+  IPC::ScopedIPCSupport scoped_ipc_support(g_io_thread->task_runner());
+  if (g_nacl_browser_mojo_fd != -1) {
+    LOG(ERROR) << "Setting up Mojo channel in NaCl";
+//    mojo::edk::SetParentPipeHandle(mojo::edk::ScopedPlatformHandle(
+//        mojo::edk::PlatformHandle(g_nacl_browser_mojo_fd)));
+  }
+
   if (g_manifest_service_fd != -1) {
     // Manifest service must be created on IOThread so that the main message
     // handling will be done on the thread, which has a message loop