* changes:
  Remove some cases for turning off arf.
  Modified Aq1 and Aq2

Add some rate control metrics.

Change-Id: Ie87c617bbdc31b0324c7c96a042f7bdb8aaa9c7e

Flipping arf on and off too often is hurting some clips.
This change makes no difference for 50-75% of our test
clips but helps some by a big margin. (eg. std-hd crew
by 6% and one of the YT and YT-hd clips by 14%)

Average improvements for 2 pass, speed 2 (psnr,ssim)
are as follows:-

derf  0.165%, 0.210%
yt  1.210%, 1.464%
yt-hd 1.189%, 1.471%
std-hd 1.031%, 0.886%

Change-Id: I121fe66cfb4a62d384b23b484a7d648789641969

Change-Id: I6ec6e072fcd59f9b5fac4ce221a86f9078103ae3

Change-Id: I08a4364672cf8171932e8e85fb74fcbfa4b27d2d

Change-Id: I716ea2967c6771d7adea571406f315a3197eab93

Two convolve functions were optimized for AVX2:
1. vp9_filter_block1d16_h8
2. vp9_filter_block1d16_v8
vp9_filter_block1d16_v8 was optimized for AVX2 by reducing the number of
loop strides by half, two strides were processed in parallel.
vp9_filter_block1d16_v8 was also optimized in the same way also some of the
loads were being done outside of the loop and by that preventing redundant
loads.
This Optimization gives 43% function level gain and 1.3% user level gain.
Now can be compiled in Windows

Change-Id: I2714124cfb0c14a77d7a0ce126a20db92ffbf92c

Change-Id: I39d78facc79a364cdc529b8cc4930d74f766d413

Change-Id: I668afb50614644d2eac2e968e1fafd6d73170bec

The current code removed the check to only perform the filter8.

Change-Id: Ie54e19a77745042a5660eab986d9ef1c42e82410

Change-Id: I036e815ca63d00cba71202ae09ba0f6ef745dcb8

Change-Id: Id53b574a4ecb5c8749383b3758c46b6bc1b275d5

Use size_t for DecodeFrame()'s size arg, and cast only
at the vpx_codec_decode() call site. This silences warnings that
appear in svc_test.cc when building with vs2013.

Change-Id: I2cf39f02a45732c752097f07b0c7ad414b1517d8

Change-Id: Id15285aa48ac6d8fec19a1946e6391412d84f5be