Expose MGL interface through NaCl IRT

mojo/public/platform/nacl/BUILD.gn

 # Copyright 2014 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.
 
 import("../../mojo_sdk.gni")
 
 mojo_sdk_source_set("mojo_irt_header") {
   sources = [
     "mojo_initial_handle.h",
     "mojo_irt.h",
   ]
-  mojo_sdk_deps = [ "mojo/public/c/system" ]
+  mojo_sdk_deps = [
+    "mojo/public/c/gpu:MGL",
+    "mojo/public/c/gpu:MGL_onscreen",
+    "mojo/public/c/gpu:MGL_signal_sync_point",
+    "mojo/public/c/system",
+  ]
 }
 
 # Untrusted code
 if (is_nacl) {
   # Thunk mapping the Mojo public API onto NaCl syscalls.
   mojo_sdk_source_set("mojo") {
     sources = [
       "libmojo.cc",
     ]
     mojo_sdk_deps = [ "mojo/public/c/system" ]
     deps = [
       ":mojo_irt_header",
     ]
   }
 
   mojo_sdk_source_set("system") {
     sources = [
       "mojo_main_thunk.cc",
     ]
     mojo_sdk_deps = [
       "mojo/public/c/system",
       "mojo/public/platform/nacl:mojo",
       "mojo/public/platform/nacl:mojo_irt_header",
     ]
     deps = [
       ":mojo_irt_header",
     ]
   }
 }