Revert "Remove CpuMonitor and related, unused, code."

webrtc/base/fakecpumonitor.h

 /*
  *  Copyright 2013 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#import <UIKit/UIKit.h>
+#ifndef WEBRTC_BASE_FAKECPUMONITOR_H_
+#define WEBRTC_BASE_FAKECPUMONITOR_H_
 
-#import "ARDAppDelegate.h"
+#include "webrtc/base/cpumonitor.h"
 
-int main(int argc, char* argv[]) {
-  @autoreleasepool {
-    return UIApplicationMain(
-        argc, argv, nil, NSStringFromClass([ARDAppDelegate class]));
+namespace rtc {
+
+class FakeCpuMonitor : public rtc::CpuMonitor {
+ public:
+  explicit FakeCpuMonitor(Thread* thread)
+      : CpuMonitor(thread) {
   }
-}
+  ~FakeCpuMonitor() {
+  }
+
+  virtual void OnMessage(rtc::Message* msg) {
+  }
+};
+
+}  // namespace rtc
+
+#endif  // WEBRTC_BASE_FAKECPUMONITOR_H_