add google Maven repo to build.gradle

src/java/JavaFileStorageTest-AS/build.gradle

@@ -3,6 +3,10 @@
 buildscript {
     repositories {
         jcenter()
+        maven {
+            url 'https://maven.google.com/'
+            name 'Google'
+        }
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.0.1'
@@ -17,6 +21,7 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        google()
     }
 }