Changes made: * VideoProcessorIntegrationTest definition goes in .h file. * Member function definitions go into .cc file. * Tests move to _libvpx.cc and _openh264.cc files. BUG=webrtc:6634 Review-Url: https://codereview.webrtc.org/3008913002 Cr-Commit-Position: refs/heads/master@{#19637}