Fix chromium png bitblt error and reinstate tests#19871

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stacey-gammon wants to merge 8 commits intoelastic:masterfrom

stacey-gammon:2018-06-13-chromium-png-bug-tests

Commits on Jul 10, 2018

bring back chromium tests
Stacey Gammon
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Run only chromium reporting tests, multiple times
Stacey Gammon
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catch the error sooner
Stacey Gammon
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add a retry
Stacey Gammon
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parse data to png earlier in order to catch a bug
Stacey Gammon
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fix tests that still use buffer return val from captureScreenshot function
Stacey Gammon
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testing
Stacey Gammon
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unskip the reporting tests
Stacey Gammon
committed