libvpx: Pull from upstream

- Roll to pick up vp9 bitstream fix. 858475a

Current HEAD: 93f88ab55abfe0262789d6312f549d3adc484c58

git log from upstream:
93f88ab Merge "Fix loopfilter of leftmost 4x4 edges in SB"
858475a Fix loopfilter of leftmost 4x4 edges in SB
4eb8c56 Merge "Allocate memory using appropriate expected alignment in unit tests."
ac6ea2a Allocate memory using appropriate expected alignment in unit tests.
0c8e13d Merge "Add some unaligned test vectors"
98188e0 Merge "Remove emms - that shouldn't be there."
fc033b3 Remove emms - that shouldn't be there.
cc774c8 variance_test: use REGISTER_STATE_CHECK
ba42c02 Add missing SECTION .text marker in assembly file.
54b2a59 Implement SSE2 block_error.
7756e98 Merge "Add subtract_block SSE2 version and unit test."
9a48048 Merge "SSE2/SSSE3 optimizations and unit test for sub_pixel_avg_variance()."
25c588b Add subtract_block SSE2 version and unit test.
869d770 Merge "Get some speed back for cpuused 1"
45e25a7 Get some speed back for cpuused 1
6172118 Merge "rename variables to avoid build error in MSVC"
ee07a26 rename variables to avoid build error in MSVC
e6cd5ed Merge "Implement sse2 and ssse3 versions for all sub_pixel_variance sizes."
1e6a32f SSE2/SSSE3 optimizations and unit test for sub_pixel_avg_variance().
84490a1 Merge "clean out libvpx-srcs.txt if built"
975df8c clean out libvpx-srcs.txt if built
43d04ef Merge "Revert "test_libvpx: disable pthreads in gtest""
f2dc382 Revert "test_libvpx: disable pthreads in gtest"
8fb6c58 Implement sse2 and ssse3 versions for all sub_pixel_variance sizes.
639db57 Add some unaligned test vectors

BUG=165504
TBR=wwcv

Review URL: https://codereview.chromium.org/17604002

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libvpx@208227 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
libvpx: Pull from upstream

Fixes a bitstream loopfilter bug.

Current HEAD: 527fc5caf63130cf833799060764ec0bafa48940
git log from upstream:
527fc5c Fix loopfilter bug

BUG=259116
TBR=scherkus,wwcv

Review URL: https://codereview.chromium.org/18999008

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libvpx@210966 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
libvpx: Pull from upstream

Fixes a few vp9 bitstream bugs. This CL will affect all current
VP9 encoded streams.

Current HEAD: 33149cbb4c106495d3b99716f8fc32bb41ddfce1

git log from upstream:
33149cb Replace generated quant tables with static lookup tables.
3f45406 Fix above context pointers
d19ed5f Change to extend full border only when needed
a801f7a Increase border size from 96 to 160.
e39bd64 Fixing vp9_get_pred_context_comp_ref_p function.

BUG=259166
TBR=tomfinegan

Review URL: https://codereview.chromium.org/19445002

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libvpx@211873 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Add OWNERS for third_party/libvpx/.

R=tomfinegan@chromium.org

Review URL: https://codereview.chromium.org/16580003

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libvpx@211874 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
libvpx: enable building for iOS devices (armv7)

R=johannkoenig@google.com

Review URL: https://codereview.chromium.org/19716002

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libvpx@212364 4ff67af0-8c30-449e-8e8b-ad334ec8d88c