diff -r 000000000000 -r 6474c204b198 hal/fallback/FallbackProcessPriority.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hal/fallback/FallbackProcessPriority.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Hal.h"
+
+using namespace mozilla::hal;
+
+namespace mozilla {
+namespace hal_impl {
+
+void
+SetProcessPriority(int aPid,
+                   ProcessPriority aPriority,
+                   ProcessCPUPriority aCPUPriority,
+                   uint32_t aBackgroundLRU)
+{
+  HAL_LOG(("FallbackProcessPriority - SetProcessPriority(%d, %s, %u)\n",
+           aPid, ProcessPriorityToString(aPriority, aCPUPriority),
+           aBackgroundLRU));
+}
+
+} // hal_impl
+} // namespace mozilla