Camera1 tests are now separated from general CameraVideoCapturer tests. Main motivation behind these changes is that Camera2 implementation can be tested using the same tests. CL also reduces code duplication on tests using textures. BUG=webrtc:5519 Review-Url: https://codereview.webrtc.org/2024843002 Cr-Commit-Position: refs/heads/master@{#13130}