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HardwareVideoEncoderFactory can now take an EglBase.Context on creation. When it does, it creates video encoders in texture mode. It uses the COLOR_FormatSurface colorFormat. It passes the EglBase.Context to the HardwareVideoEncoder. The HardwareVideoEncoder sets up an input surface for its codec and handles incoming frames by drawing them onto the input surface. BUG=webrtc:7760 R=pthatcher@webrtc.org, sakal@webrtc.org Review-Url: https://codereview.webrtc.org/2977153003 . Cr-Commit-Position: refs/heads/master@{#19083}