Base: Add power requirements to the System monitor.

base/system_monitor/system_monitor_posix.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
 #include "base/system_monitor/system_monitor.h"
 
 namespace base {
 
+void SystemMonitor::BeginPowerRequirement(PowerRequirement requirement,
+                                          const std::string& reason) {
+  if (requirement == CPU_REQUIRED)
+    return;
+
+  NOTIMPLEMENTED();
+}
+
+void SystemMonitor::EndPowerRequirement(PowerRequirement requirement,
+                                        const std::string& reason) {
+  if (requirement == CPU_REQUIRED)
+    return;  // Nothing to do.
+
+  NOTIMPLEMENTED();
+}
+
 bool SystemMonitor::IsBatteryPower() {
   NOTIMPLEMENTED();
   return false;
 }
 
 }  // namespace base