Under a feature flag, start setting up "Strict Mode" prefix for warnings.#13109

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flarnie wants to merge 9 commits intofacebook:masterfrom

flarnie:strictStricterStrictestMode

Commits on Jun 20, 2018

Add initial failing test for strict mode warning prefixes
flarnie
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Commits on Jun 25, 2018

Start work to add 'Strict Mode' prefix to warnings in <StrictMode />
flarnie
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Change flag to method to further hide implementation details
flarnie
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