Don't skip right/bottom border pixels in SSIM calculations.

Change-Id: I75acb55ade54bef6ad7703ed5e691581fa2f8fe1
Only do metrics on cropped (visible) area of picture.

The part where we align it by 8 or 16 is an implementation detail that
shouldn't matter to the outside world.

Change-Id: I9edd6f08b51b31c839c0ea91f767640bccb08d53
Eliminated prev_mip memsets/memcpys in encoder

This patch swaps ptrs instead of copying and uses the
last show_frame flag instead of setting the entire buffer
to zero.  On the decode side, forced prev_mi to always point
to a valid mode info buffer.  Required by the next frame.

Change-Id: I90441eaf087868e9f9bc368e15e0becc848c4a51
Trivial change to add crude timing information for encoding section

Change-Id: I84e07c2f1240b95d5de083df06eb3d581bfb9b68
Merge "Don't skip right/bottom border pixels in SSIM calculations." into experimental
Merge "Only do metrics on cropped (visible) area of picture." into experimental