keep GoogleUtils (#1467)

* keep GoogleUtils

Author: elharo

google-api-client/pom.xml

@@ -145,10 +145,23 @@
       <artifactId>commons-codec</artifactId>
       <scope>provided</scope>
       <version>1.14</version>
-   </dependency>
+    </dependency>
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
     </dependency>
+    <dependency>
+      <groupId>androidx.annotation</groupId>
+      <artifactId>annotation</artifactId>
+      <version>1.1.0</version>
+    </dependency>
   </dependencies>
+  
+  <repositories>  
+    <repository>
+      <id>google</id>
+      <name>Google Maven Repository</name>
+      <url>https://maven.google.com/</url>
+    </repository>
+  </repositories>
 </project>

google-api-client/src/main/java/com/google/api/client/googleapis/GoogleUtils.java

@@ -14,6 +14,7 @@
 
 package com.google.api.client.googleapis;
 
+import androidx.annotation.Keep;
 import com.google.api.client.util.SecurityUtils;
 import com.google.common.annotations.VisibleForTesting;
 import java.io.IOException;
@@ -30,6 +31,7 @@
  * @since 1.12
  * @author [email protected] (Ravi Mistry)
  */
+@Keep
 public final class GoogleUtils {
 
   /** Current release version. */