Add WebAudio codec tests and oscillator test
Add WebAudio codec tests and oscillator test

WebAudio on Android uses a different set of libraries for decoding
audio (MediaCodec) and for performing FFTs (OpenMAX_DL). Add the codec
tests and one oscillator test (which uses FFTs) to the smoke tests so
we can catch any regressions.

BUG=463650

Review URL: https://codereview.chromium.org/978593002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191316 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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