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Add observer#152

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AirChen wants to merge 2 commits into

google:mastergoogle/promises:masterfrom

AirChen:develop_observerAirChen/promises:develop_observerCopy head branch name to clipboard

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Add observer#152
AirChen wants to merge 2 commits into
google:masterfrom
AirChen:develop_observer

Append testcase import file

b00ce46

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