Add Mic Toggle button to AppRTCDemo (Android).

webrtc/examples/androidapp/src/org/appspot/apprtc/CallActivity.java

Index: webrtc/examples/androidapp/src/org/appspot/apprtc/CallActivity.java
diff --git a/webrtc/examples/androidapp/src/org/appspot/apprtc/CallActivity.java b/webrtc/examples/androidapp/src/org/appspot/apprtc/CallActivity.java
index 239988a97dfae85c80582c39c3db297876068726..21092227ccabd0a1cc8fdbde87b497b382701636 100644
--- a/webrtc/examples/androidapp/src/org/appspot/apprtc/CallActivity.java
+++ b/webrtc/examples/androidapp/src/org/appspot/apprtc/CallActivity.java
@@ -132,6 +132,7 @@ public class CallActivity extends Activity
   private boolean isError;
   private boolean callControlFragmentVisible = true;
   private long callStartedTimeMs = 0;
+  private boolean micEnabled = true;
 
   // Controls
   private CallFragment callFragment;
@@ -337,6 +338,15 @@ public class CallActivity extends Activity
     }
   }
 
+  @Override
+  public boolean onToggleMic() {
+    if (peerConnectionClient != null) {
+      micEnabled = !micEnabled;
+      peerConnectionClient.setAudioEnabled(micEnabled);
+    }
+    return micEnabled;
+  }
+
   // Helper functions.
   private void toggleCallControlFragmentVisibility() {
     if (!iceConnected || !callFragment.isAdded()) {