Update CPU Monitor to report CPU frequency and battery level.

webrtc/examples/androidapp/src/org/appspot/apprtc/util/LooperExecutor.java

 /*
  *  Copyright 2015 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.
  */
 
 package org.appspot.apprtc.util;
 
 import android.os.Handler;
 import android.os.Looper;
 import android.util.Log;
 
+import java.util.LinkedList;
+import java.util.List;
 import java.util.concurrent.Executor;
 
 /**
  * Looper based executor class.
  */
 public class LooperExecutor extends Thread implements Executor {
   private static final String TAG = "LooperExecutor";
   // Object used to signal that looper thread has started and Handler instance
   // associated with looper thread has been allocated.
   private final Object looperStartedEvent = new Object();
+  private final List<Runnable> scheduledPeriodicRunnables = new LinkedList<Runnable>();
   private Handler handler = null;
   private boolean running = false;
   private long threadId;
 
   @Override
   public void run() {
     Looper.prepare();
     synchronized (looperStartedEvent) {
       Log.d(TAG, "Looper thread started.");
       handler = new Handler();
@@ skipping 35 matching lines @@
         Log.d(TAG, "Looper thread finished.");
       }
     });
   }
 
   // Checks if current thread is a looper thread.
   public boolean checkOnLooperThread() {
     return (Thread.currentThread().getId() == threadId);
   }
 
+  public synchronized void scheduleAtFixedRate(final Runnable command, final long periodMillis) {
+    if (!running) {
+      Log.w(TAG, "Trying to schedule task for non running executor");
+      return;
+    }
+    Runnable runnable = new Runnable() {
+      @Override
+      public void run() {
+        if (running) {
+          command.run();
+          if (!handler.postDelayed(this, periodMillis)) {
+            Log.e(TAG, "Failed to post a delayed runnable in the chain.");
+          }
+        }
+      }
+    };
+    scheduledPeriodicRunnables.add(runnable);
+    if (!handler.postDelayed(runnable, periodMillis)) {
+      Log.e(TAG, "Failed to post a delayed runnable.");
+    }
+  }
+
+  public synchronized void cancelScheduledTasks() {
+    if (!running) {
+      Log.w(TAG, "Trying to cancel schedule tasks for non running executor");
+      return;
+    }
+
+    // Stop scheduled periodic tasks.
+    for (Runnable r : scheduledPeriodicRunnables) {
+      handler.removeCallbacks(r);
+    }
+    scheduledPeriodicRunnables.clear();
+  }
+
   @Override
   public synchronized void execute(final Runnable runnable) {
     if (!running) {
       Log.w(TAG, "Running looper executor without calling requestStart()");
       return;
     }
     if (Thread.currentThread().getId() == threadId) {
       runnable.run();
     } else {
       handler.post(runnable);
     }
   }
 
 }