Use ChannelMojo for NaCl PPAPI channels.

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 b90f14ae80123e7535a58695ddf8e1f52b94a18b..f59655e1d5f1f1868b46018006a8b5bdd59b51db 100644
--- a/ppapi/nacl_irt/plugin_startup.cc
+++ b/ppapi/nacl_irt/plugin_startup.cc
@@ -27,8 +27,7 @@ base::Thread* g_io_thread = NULL;
 ManifestService* g_manifest_service = NULL;
 
 bool IsValidChannelHandle(IPC::ChannelHandle* handle) {
-  // ChannelMojo not yet supported.
-  return handle && handle->socket.fd != -1 && !handle->mojo_handle.is_valid();
+  return handle && (handle->socket.fd != -1 || handle->mojo_handle.is_valid());

[Mark Seaborn, 2016/10/13 21:27:51]

Shouldn't this only accept Mojo handles?

[Sam McNally, 2016/10/14 02:35:03]

It's used by both SFI and non-SFI. In SFI mode they still look like FDs. I've
added ifdefs to make it clearer.

 }
 
 // Creates the manifest service on IO thread so that its Listener's thread and