Refactor the vp9_get_frame code for frame parallel.
In frame parallel decoding mode, there will be still several frames inside the decoder when application stop calling vpx_codec_decode to decode frames. The application will need to keep calling vpx_codec_get_frame to get all the remaining decoded frames in the decoder. Change-Id: I2ce8260a91282f045bb9a6093ff8a606b1990f14
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