Add google() to the list of public repos.

Allow fetching from Google maven when ALLOW_PUBLIC_REPOS env
variable is set.

Test: None
Change-Id: Iaf22cbd341009c05328e69814a8ce6b33bab36e0
diff --git a/buildSrc/repos.gradle b/buildSrc/repos.gradle
index 6ee60e1..caedf3a 100644
--- a/buildSrc/repos.gradle
+++ b/buildSrc/repos.gradle
@@ -44,6 +44,7 @@
     if (System.getenv("ALLOW_PUBLIC_REPOS") != null) {
         handler.mavenCentral()
         handler.jcenter()
+        handler.google()
     }
     def androidPluginRepoOverride = System.getenv("GRADLE_PLUGIN_REPO")
     if (androidPluginRepoOverride != null) {