buildscript {
    ...
    dependencies {
        ...
        classpath 'com.google.gms:google-services:3.0.0'
    }
}

apply plugin: 'com.android.application'

android {
  ...
}

dependencies {
  ...
  compile 'com.google.firebase:firebase-core:10.0.1' //Для аналитики достаточно
}

apply plugin: 'com.google.gms.google-services'