Convert Vr tests to JUnit4
patch from issue 2857583005 (http://crrev.com/2857583005)
Convert Vr tests in chrome_public_test_vr_apk to JUnit4. For more detail,
please check src/testing/android/docs/junit4.md
Also removes the image tests from VrShellTest.java since:
1. They provide no actual test coverage since Render Tests don't actually fail currently AND the way they captured screenshots is pretty much useless for VR (just captures a black screen)
2. The move to JUnit4 seems to have messed with them - each call to renderAndCompare was taking an absurd amount of time (30+ seconds each).
BUG=640116
Review-Url: https://codereview.chromium.org/2876223004
Cr-Commit-Position: refs/heads/master@{#471965}
5 files changed