Add a new intra prediction mode "smooth".
This is added as part of ALT_INTRA experiment. This uses interpolation between top row and estimated bottom row; as well as left column and estimated right column to generate the predicted block.The interpolation is done using a predefined weight array. Based on experiments, the currently chosen weight array was created to represent a quadratic curve, but can be tuned further if needed. Improvement from baseline on Derf set: ALL Keyframes: 1.279% Improvement from existing ALT_INTRA: ALL Keyframes: 1.146% Change-Id: I12637fa1b91bd836f1c59b27d6caee2004acbdd4
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