New decoder control paramter VP8_SET_DECRYPT_KEY to set the decryption key. Change-Id: I6fc1f44d41f74f3b3f702778af1a6f8f5cc9439f
Include upstream changes (unit test fixes, in particular) into the merged code base. Change-Id: I096f8a9d09e2532fbec0c95d7a995ab22fa54b29