The color contrast check should use the most contrasting pixel instead of the average#11

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nanwng wants to merge 2 commits intogoogle:masterfrom nanwng:colorContrastFix

+93-16

Commits on Apr 17, 2019

The color contrast check should use the most contrasting pixel instead of the average
Nan Wang
committed

Commits on Apr 18, 2019

updated from review, added new checks to keep the current ones as is
Nan Wang
committed