Ian Hickson 93b0265199
Fix flutter_gallery_instrumentation_test (#20361)
Somehow I forgot to say "super.tap()" when calling "tap()" on the new
superclass, so it was just recursing infinitely but ended up actually
crashing on the first reuse of the finder.

The error was previously swallowed, I made this print it instead.
2018-08-09 16:57:41 -07:00
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