libvpx: Pull from upstream

libvpx: Pull from upstream

Current HEAD: 681d5e9024c7dab82706507037c01a067e0ea89d

git log from upstream:
53c3f2c Only allow for cyclic refresh (aq=3 mode) for base layer.
7efb302 Indent build/make/configure.sh
ea494c0 Fix some minor nits.
a7b2d09 Added highbitdepth sse2 acceleration for quantize
f5209d7 Remove rate component adjustment for AQ1
1663eff Switch AQ1 segment basis from q ratio to rate ratio.
fc47c5d Add adaptive midpoint for AQ1.
d031237 Add variance restriction to AQ2.
3d1e8c9 Further AQ1 clean up.
6a760d4 Initial AQ1 restructuring.
a0d1582 vp9_thread_test: fix 'had_error' assignment
bc1b3d8 Allow DC/H/V/TM on screen content.
722e9d6 Drop special inter mode selection for screen content.
eafa0d0 Remove armv5te target
08ad7e4 Correctly initialize "ones" value in neon quantize
379334c vp9_ethread: move filter_cache out of RD_OPT struct
5e5da2e Fix bug in calculating number of mbs with scaling.
16d2696 sad_test: fix vp8-only build
ad7586a vp9_ethread: move max/min partition size to mb struct
b0efddd vp9_ethread: change mask_filter to a local variable
70c9d29 Revert "vp9_ethread: include a pointer to mb in VP9_COMP"
c42715b Enable ssse3 version of vp9_fdct8x8_quant
4c12046 Changes SvcContext_t to SvcContext
21db24e Add a reset to rc tracking for dropped frames
c6908fd Combine fdct8x8 and quantization process
2d3cc8e Add sse2 version for vp9_quantize_fp
ffa06b3 Prevent severe rate control errors in CBR mode
b660f72 Modify active_worst_quality setting for one pass CBR.
1687c47 change to call vp9_refining_search_sad() directly
a62c87f Add empty pointer check to pred buffering in rtc coding mode
87ae6d7 Code cleanup: remove unused members in RD_OPT
d0b547c vp9_ethread: combine encoder counts in separate struct
48032bf Added sse2 acceleration for highbitdepth variance
00c385f Visual studio build fix using explicit cast
<...>

TBR=tomfinegan@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=293082

[Johann, 2014-11-24 20:14:30]

Committed patchset #1 (id:1) manually as r293082 (presubmit successful).

[Tom Finegan, 2014-11-24 20:22:51]

On 2014/11/24 20:14:30, Johann wrote:
> Committed patchset #1 (id:1) manually as r293082 (presubmit successful).

lgtm