Short circuit flat blocks when coding screen content at realtime speed.
In inter mode search skip all modes except NEARESTMV and DC_PRED. 10% less encode latency for large frames using the chromium remoting_perftests. +0.313% BDRATE on the screencast set at speed -6. Change-Id: Ib97a39dd8bcdeab545509e0e02d78ce7033f8c63
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