Turn on frame_sign_bias by default.
This experiment of frame_sign_bias is to remove the 7 bits in the frame header that signal the sign bias value for the 7 reference frames. Instead of explicit signaling, this experiment is to use the frame_offset value to derive the frame sign bias. It achieves -0.08~-0.1% coding gain on average. It has been adopted by AOM. Change-Id: I543f2641d9a11cabfe822cd4daa8b88b938421d6
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