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headless_browser_tests fail with native window occlusion turned on.
Specifically, headless browser tests have |root_window_hwnd| of 0, which
causes a DCHECK when the tracking is disabled for the window.

This is in preparation for enabling native window occlusion by default.

Bug: 813093
Change-Id: I525f8f1c1572654bc5e5ea25dca385d3d7c48fb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815609Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698636}