title: slow or fast drag up (scroll) using robotium
body: <p>this my code for drag up current screen.</p>
  
  <pre><code>int screenWidth = getActivity().getWindowManager().getDefaultDisplay().getWidth();
  int screenHeight = getActivity().getWindowManager().getDefaultDisplay().getHeight();
  int fromX, toX, fromY, toY = 0;
  fromX = screenWidth/2;
  toX = screenWidth/2;
  fromY = (screenHeight/2) + (screenHeight/3);
  toY = (screenHeight/2) - (screenHeight/3);
  int scroll_time = 10000;             
  solo.sleep(5000);
      // Drag UP  
  solo.drag(fromX, toX, fromY, toY, 40);
  Log.d(TAG, "Drag 1");
      // here default origin (x,y = 0,0) is left upper corner
  </code></pre>
  
  <p>here scroll is working but very slow.</p>
  
  <p>So for fast scroll what changes in this code required ?</p>