Add CpuMonitor to Android ApprtcDemo

R=magjed@webrtc.org, perkj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/38169004

Cr-Commit-Position: refs/heads/master@{#8444}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8444 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/examples/android/src/org/appspot/apprtc/CallFragment.java

@@ -59,6 +59,7 @@ public class CallFragment extends Fragment {
   private boolean displayHud;
   private volatile boolean isRunning;
   private TextView hudView;
+  private final CpuMonitor cpuMonitor = new CpuMonitor();
 
   /**
    * Call control interface for container activity.
@@ -224,6 +225,15 @@ public class CallFragment extends Fragment {
           .append(actualBitrate)
           .append("\n");
     }
+
+    if (cpuMonitor.sampleCpuUtilization()) {
+      stat.append("CPU%: ")
+          .append(cpuMonitor.getCpuCurrent())
+          .append("/")
+          .append(cpuMonitor.getCpuAvg3())
+          .append("/")
+          .append(cpuMonitor.getCpuAvgAll());
+    }
     encoderStatView.setText(stat.toString());
     hudView.setText(bweBuilder.toString() + hudView.getText());
   }