title: Camera 2 Api preview is stretched
body: <p>I work with old camera api and camera 2 api, using GlSurfaceView.
  when I get necessary aspect ratio in old api I use
   Camera.Parameters</p>
  
  <pre><code>camParams.setPreviewSize(previewW, previewH);
         if(isPictureSizeSupported(camParams, newSize)) {
             camParams.setPictureSize(newSize.getWidth(), newSize.getHeight());
         }
  </code></pre>
  
  <p>if it will not be called, preview is streched</p>
  
  <p>Q: How to get such effect in camera 2 api?</p>