59a677ada2
This CL should not change any visible behaviour. It does the following: * Extract GLES rendering into separate class GlRectDrawer. This class is also needed for future video encode with OES texture input. * Clean up current ScalingType -> display size calculation and introduce new SCALE_ASPECT_BALANCED (b/21735609) and remove unused SCALE_FILL. * Replace current mirror/rotation index juggling with android.opengl.Matrix operations instead. Review URL: https://codereview.webrtc.org/1191243005 Cr-Commit-Position: refs/heads/master@{#9496}