This commit adds the ability of validating matched encoder and
decoder to unit tests.

Change-Id: Ie00d69a42477b6a69b324a6bd134939684f7300b

using large values for the timebase, e.g., {33333, 1000000} could
rollover the timestamp calculation in vp8e_encode as it was not using
64-bit math.

originally reported on ffmpeg's trac:
  https://ffmpeg.org/trac/ffmpeg/ticket/1014

BUG=468

Change-Id: Iedb4e11de086a3dda75097bfaf08f2488e2088d8

Change-Id: I018335a08cbb1eca55896c21e36918ed45a4b2a8

Change-Id: I99937cbdd6bfe52b7c8ae42f05526dfc06a602f4

Change-Id: I1d99c56d1e1f521507978737fc661ca90af72507

This unit test tests vp8_sixtap_predict function against preset
data and random generated data. The test against preset data
checks the correctness of the functions, and the test against
random data checks if the optimized six-tap predictor functions
generate matching result as the c functions. It tests the
following functions:
vp8_sixtap_predict16x16_c
vp8_sixtap_predict16x16_mmx
vp8_sixtap_predict16x16_sse2
vp8_sixtap_predict16x16_ssse3

vp8_sixtap_predict8x8_c
vp8_sixtap_predict8x8_mmx
vp8_sixtap_predict8x8_sse2
vp8_sixtap_predict8x8_ssse3

vp8_sixtap_predict8x4_c
vp8_sixtap_predict8x4_mmx
vp8_sixtap_predict8x4_sse2
vp8_sixtap_predict8x4_ssse3

vp8_sixtap_predict4x4_c
vp8_sixtap_predict4x4_mmx
vp8_sixtap_predict4x4_ssse3

Change-Id: I6de097898ebca34a4c8020aed1e8dde5cd3e493b

We need an easy way to build the unit test driver without running the
tests. This enables passing options like --gtest_filter to the
executable, which can't be done very cleanly when running under
`make test`.

Fixed a number of compiler errors/warnings when building the tests
in various configurations by Jenkins.

Change-Id: I9198122600bcf02520688e5f052ab379f963b77b

Change-Id: I1607676879c29adc0173a3c0355a0e5d8a84fc3b

Change-Id: I7dadadeb99bee5a51219f46fe11c760fc294c735

To do so we add a framework for encoding a yv12 file..

Change-Id: I94a061eb916beaf6cde920cf1aaadb6eed10a717

This is a unit test for the post-processing functions:
- vp8_post_proc_down_and_across_c
- vp8_post_proc_down_and_across_mmx
- vp8_post_proc_down_and_across_xmm

Change-Id: Iec3e690327b17470209c00417835473f6d9a35d6

This currently has no effect and can create an artificial lag in e.g.,
realtime.

Change-Id: Ia1c7c6dbe7c6fe82a944f087f1b0d1dbbc0aa1b6

Adds a test that ensures the application is able to trigger frame size
changes via vpx_codec_enc_config_set()

Change-Id: I231c062e533d75c8d63c5f8a5544650117429a63

Implements a couple simple tests of the encoder API using the gtest
framework:

  TestDisableKeyframes
  TestForceKeyframe
  TestKeyframeMaxDistance

Change-Id: I38e93fe242fbeb30bb11b23ac12de8ddc291a28d

Consolodate the unit tests under vp8/ to the test/ directory

Change-Id: I6d6a0fb60f5e3874a4d6710e9e121dd3e81a93db

Rework unit tests  to have a single executable rather than many, which
should avoid pollution of the visual studio project namespace, improve
build times, and make it easier to use the gtest test sharding system
when we get these going on the continuous build cluster.

Change-Id: If4c3e5d4b3515522869de6c89455c2a64697cca6