libvpx: Pull from upstream

libvpx: Pull from upstream

- Roll to pick up win64 warning fix. 0373e51

Current HEAD: 4f4713b4170b61fcbef2be3f097c30c806a9a0f2

git log from upstream:
4f4713b Merge "Add unit tests for 4x4 ADST"
0373e51 Merge "Cast value to avoid size_t/int warning on win64"
8283d89 Merge "Renaming 'nmv' to 'mv' for several functions."
77186ee Merge "Function decomposition inside vp9_decodemv.c file."
7947a33 Improving model rd with variance and quant step
d94aee6 Cast value to avoid size_t/int warning on win64
9f2a1ae adds force partitioning greater than or less than block size
18bdf70 adds a set partitioning to speed features
476d73d partition by variance using var from last frame
1f94b97 convert all speed things to speed features
727fa7b new partition via variance
0fad6a9 fix to set up new speed feature
df2314c don't copy partitions for key frames or altrefs
f954490 disable speed > 1 speed corrections in firstpass
2c6bdbb new debug modes code
fbcce4d Merge "copy partitioning from last fame"
f033b44 copy partitioning from last fame
362809d Add unit tests for 4x4 ADST
db938c2 Merge "test_libvpx: disable pthreads in gtest"
6e3b34b Removed a number of unnecessary check on ref_frame
15eaba1 Function decomposition inside vp9_decodemv.c file.
90a9900 test_libvpx: disable pthreads in gtest
3656835 Merge "Add two-pass quantization"
b5bf7b1 Add two-pass quantization
12180c8 Remove unnecessary copying of probs.
87e1fa7 Renaming 'nmv' to 'mv' for several functions.
2319b7a Merge "tests: clear system state after non-API calls"
5b75674 tests: clear system state after non-API calls

BUG=165504
TBR=hclam, wwcv

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=207480

[fgalligan1, 2013-06-20 18:11:20]

Committed patchset #1 manually as r207480 (presubmit successful).