1. Fixed a crash when orientation changes and the content
is scrolled due to wrong size bitmap being requested.
2. Closed a file dscriptior that was being left open.
3. Clearing the bitmap before passing it to the renderer to
ensure it is white for pixels not touched when rendering.
4. Removed debug logs.
5. Switched to the correct layout manager for RecyclerView.
bug:16966145
Change-Id: I8ab9d22635c93cac5ff85c6f4b5d82e58cd8df5c
6f249835a4