Java VideoRenderer.Callbacks: Make renderFrame() interface asynchronous

talk/app/webrtc/java/android/org/webrtc/VideoCapturerAndroid.java

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
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       @Override public void run() {
         startPreviewOnCameraThread(width, height, framerate);
       }
     });
   }
 
   public synchronized List<CaptureFormat> getSupportedFormats() {
     return CameraEnumerationAndroid.supportedFormats.get(id);
   }
 
+  // Return a list of timestamps for the frames that have been sent out, but not returned yet.
+  // Useful for logging and testing.
+  public String pendingFramesTimeStamps() {
+    return videoBuffers.pendingFramesTimeStamps();
+  }
+
   private VideoCapturerAndroid() {
     Log.d(TAG, "VideoCapturerAndroid");
   }
 
   // Called by native code.
   // Enumerates resolution and frame rates for all cameras to be able to switch
   // cameras. Initializes local variables for the camera named |deviceName| and
   // starts a thread to be used for capturing.
   // If deviceName is empty, the first available device is used in order to be
   // compatible with the generic VideoCapturer class.
@@ skipping 511 matching lines @@
     }
 
     private native void nativeCapturerStarted(long nativeCapturer,
         boolean success);
     private native void nativeOnFrameCaptured(long nativeCapturer,
         byte[] data, int length, int width, int height, int rotation, long timeStamp);
     private native void nativeOnOutputFormatRequest(long nativeCapturer,
         int width, int height, int fps);
   }
 }