Since HW codecs are not as well-behaved as SW codecs, we need a way to disable the EXPECT_EQ's in the VideoProcessor integration tests for the former. This CL introduces such an ability. BUG=webrtc:6634 Review-Url: https://codereview.webrtc.org/2710913004 Cr-Commit-Position: refs/heads/master@{#17166}