Allow to print Java stack traces in Android camera, renderer and media codec.

talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java

Index: talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java
diff --git a/talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java b/talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java
index dfff8f26912fbc62d9dd08fee9997c9ce2867d43..705dcd1a35beab705e0b207c4c9852d1c2a87e54 100644
--- a/talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java
+++ b/talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java
@@ -25,7 +25,6 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-
 package org.webrtc;
 
 import android.media.MediaCodec;
@@ -62,7 +61,7 @@ public class MediaCodecVideoEncoder {
   }
 
   private static final int DEQUEUE_TIMEOUT = 0;  // Non-blocking, no wait.
-  private Thread mediaCodecThread;
+  private static Thread mediaCodecThread;
   private MediaCodec mediaCodec;
   private ByteBuffer[] outputBuffers;
   private static final String VP8_MIME_TYPE = "video/x-vnd.on2.vp8";
@@ -197,6 +196,18 @@ public class MediaCodecVideoEncoder {
     }
   }
 
+  public static void printStackTrace() {
+    if (mediaCodecThread != null) {
+      StackTraceElement[] mediaCodecStackTraces = mediaCodecThread.getStackTrace();
+      if (mediaCodecStackTraces.length > 0) {
+        Logging.d(TAG, "MediaCodecVideoEncoder stacks trace:");
+        for (StackTraceElement stackTrace : mediaCodecStackTraces) {
+          Logging.d(TAG, stackTrace.toString());
+        }
+      }
+    }
+  }
+
   static MediaCodec createByCodecName(String codecName) {
     try {
       // In the L-SDK this call can throw IOException so in order to work in