Add option to print peer connection factory Java stack traces.

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,
@@ skipping 17 matching lines @@
 package org.webrtc;
 
 import android.content.Context;
 import android.hardware.Camera;
 import android.hardware.Camera.PreviewCallback;
 import android.opengl.EGL14;
 import android.opengl.EGLContext;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.SystemClock;
-import android.text.StaticLayout;
 import android.view.Surface;
 import android.view.WindowManager;
 
 import org.json.JSONException;
 import org.webrtc.CameraEnumerationAndroid.CaptureFormat;
 import org.webrtc.Logging;
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
@@ skipping 161 matching lines @@
     if (cameraId == -1) {
       return null;
     }
 
     final VideoCapturerAndroid capturer = new VideoCapturerAndroid(cameraId, errorHandler,
         sharedContext);
     capturer.setNativeCapturer(nativeCreateVideoCapturer(capturer));
     return capturer;
   }
 
+  public void printStackTrace() {
+    if (cameraThread != null) {
+      StackTraceElement[] cameraStackTraces = cameraThread.getStackTrace();
+      if (cameraStackTraces.length > 0) {
+        Logging.d(TAG, "VideoCapturerAndroid stacks trace:");
+        for (StackTraceElement stackTrace : cameraStackTraces) {
+          Logging.d(TAG, stackTrace.toString());
+        }
+      }
+    }
+  }
+
   // Switch camera to the next valid camera id. This can only be called while
   // the camera is running.
   public void switchCamera(final CameraSwitchHandler handler) {
     if (Camera.getNumberOfCameras() < 2) {
       if (handler != null) {
         handler.onCameraSwitchError("No camera to switch to.");
       }
       return;
     }
     synchronized (pendingCameraSwitchLock) {
@@ skipping 624 matching lines @@
     private native void nativeOnByteBufferFrameCaptured(long nativeCapturer,
         byte[] data, int length, int width, int height, int rotation, long timeStamp);
     private native void nativeOnTextureFrameCaptured(long nativeCapturer, int width, int height,
         int oesTextureId, float[] transformMatrix, long timestamp);
     private native void nativeOnOutputFormatRequest(long nativeCapturer,
         int width, int height, int framerate);
   }
 
   private static native long nativeCreateVideoCapturer(VideoCapturerAndroid videoCapturer);
 }