Enabling Skia / Moterm to build with PNaCl Newlib toolchain

apps/BUILD.gn

 # Copyright 2015 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("//build/config/nacl/config.gni")
+
+# Collection of apps which are currently capable of being built as pexes.
+group("portable_apps") {
+  testonly = true
+
+  deps = [
+    "//apps/moterm",
+    "//apps/moterm:apptests",
+    "//apps/moterm:gl_helper_test_app",
+  ]
+}
+
 group("apps") {
   testonly = true
 
   deps = [
+    ":portable_apps",
     "//apps/benchmark",
     "//apps/benchmark:apptests",
-    "//apps/moterm",
-    "//apps/moterm:apptests",
-    "//apps/moterm:gl_helper_test_app",
   ]
 
   if (is_android) {
     deps += [ "//apps/shortcut" ]
   }
+
+  if (mojo_use_nacl) {
+    deps += [ ":portable_apps(//build/toolchain/nacl:newlib_pnacl)" ]
+  }
 }