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Update CONTRIBUTING.md to suggest Android Studio and fix Mac command to install android-platform-tools. (#19537)

J
Jacob Richman committed
05b4bd748cd0a9ac4d438fb1398a3ff6fb3509f9
Parent: e7d87af
Committed by Ian Hickson <ian@hixie.ch> on 8/28/2018, 11:22:50 PM