Modify CostModel to allocate optimal memory.

Change-Id: I7d52675d28bfc109d4e901581fc24cd36fcb79ee
gif2webp: Support GIF_DISPOSE_RESTORE_PREVIOUS

Tweaked the gif2webp_util API to support this.

Requested in: https://code.google.com/p/webp/issues/detail?id=144

Change-Id: I0e8c4edc39227355cd8d3acc55795186e25d0c3a
Merge "Modify CostModel to allocate optimal memory."
dec_neon: add VE4 intra predictor

based on SSE2 version, ~59% faster

Change-Id: Iaa2181eb51bd975de0e9fe5c7b66ed18188f0e3b
dec_neon: add LD4 intra predictor

based on SSE2 version, ~55% faster

Change-Id: I782282ffc31dcf238890b3ba0decccf1d793dad0
dec_neon: add TM4 intra predictor

~21% faster

Change-Id: Ia9ed4ca650f9d544821fa1faf3173611806a272a
dec_neon: add DC4 intra predictor

~70% faster

Change-Id: I2e06907b8d69be71a8c5581832c931923c24bab0
Merge "dec_neon: add VE4 intra predictor"
Merge changes I2e06907b,Ia9ed4ca6,I782282ff

* changes:
  dec_neon: add DC4 intra predictor
  dec_neon: add TM4 intra predictor
  dec_neon: add LD4 intra predictor
Unify the API between VP8BitWriter and VP8LBitWriter

BitReader will be next...

Change-Id: Icd9e7ab2e3890131e664c0523627d9b8c5399a74
dec_neon: DC4: use pair-wise adds for top row

reduces load count, slightly faster

Change-Id: I880340ef8ef75ce4ce321c330f56f86b758bda08
dsp/dec_{neon,sse2}: VE4: normalize variable names

use '0' rather than '_' when dealing with variables that result from a
shift

Change-Id: I29280c0dead645ce39dc4bb42c3e19929b302fd4
Merge "dsp/dec_{neon,sse2}: VE4: normalize variable names"
Merge "dec_neon: DC4: use pair-wise adds for top row"
update NEWS

Change-Id: Ib9b48e3611b77214bc875524249366ff62451c1b
(cherry picked from commit 0c1b98d28c1dec2ea45c101fca979b31b8db1e5b)