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Previously, the behavior that a virtual test failed because of missing
txt result while the base test were passing suprised many developers and
took them much time to find out that the virtual test suite should be
added in LayoutTests/ImageFirstTests.

Change-Id: I03c6893a4aa7468cd4a327e84d1a4195124c45cb
Reviewed-on: https://chromium-review.googlesource.com/1058330
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558549}