Bug 1170589 - Force decoder to use all allocated buffers. r=bwu

dom/media/platforms/gonk/GonkVideoDecoderManager.cpp

@@ -427,6 +427,9 @@ GonkVideoDecoderManager::codecReserved()
   format->setString("mime", mMimeType.get());
   format->setInt32("width", mVideoWidth);
   format->setInt32("height", mVideoHeight);
+  // Set the "moz-use-undequeued-bufs" to use the undeque buffers to accelerate
+  // the video decoding.
+  format->setInt32("moz-use-undequeued-bufs", 1);
   if (mNativeWindow != nullptr) {
     surface = new Surface(mNativeWindow->getBufferQueue());
   }