* 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

This function initializes the predictor buffer pointers and
calculates reference motion vectors. It is only needed in the settings
of inter frame coding. Hence removing it from the key frame coding
branch in rtc_use_partition.

Change-Id: Ic4e16c7467a5f32be4e0bf619ef9d57afb4a7075