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

Change-Id: Ie00d69a42477b6a69b324a6bd134939684f7300b

Change-Id: I813fa94c83df6282f382b24bbaccb1fe2fa94276

Also available in util.h

Change-Id: I4745d72f57c11c55772d3bf0ef15c09bd86eb5bf

The lower complexity modes may not generate a keyframe automatically.
This behavior was found when running under Valgrind, as the slow
performance caused the speed selection to pick lower complexities than
when running natively. Instead, use a fixed complexity for the
realtime auto keyframe test.

Affected tests:
  AllModes/KeyframeTest.TestAutoKeyframe/0

Change-Id: I44e3f44e125ad587c293ab5ece29511d7023be9b

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