Add ability to create pending resource hosts.

ppapi/host/resource_host.cc

Index: ppapi/host/resource_host.cc
diff --git a/ppapi/host/resource_host.cc b/ppapi/host/resource_host.cc
index 4720a23a9d0f69ef3e40c997a3926861122fb9b6..a199a972adb143b62c69e1e572df41b5b0bf9ca9 100644
--- a/ppapi/host/resource_host.cc
+++ b/ppapi/host/resource_host.cc
@@ -4,6 +4,7 @@
 
 #include "ppapi/host/resource_host.h"
 
+#include "base/logging.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/host/ppapi_host.h"
 #include "ppapi/host/resource_message_filter.h"
@@ -36,6 +37,12 @@ bool ResourceHost::HandleMessage(const IPC::Message& msg,
   return true;
 }
 
+void ResourceHost::SetPPResourceForPendingHost(PP_Resource pp_resource) {
+  DCHECK(!pp_resource_);
+  pp_resource_ = pp_resource;
+  DidConnectPendingHostToResource();
+}
+
 void ResourceHost::SendReply(const ReplyMessageContext& context,
                              const IPC::Message& msg) {
   host_->SendReply(context, msg);