docs(samples): add protobuf.util dependency to enable FieldMaskUtil (#349)

* docs(samples): add protobuf.util dependency to enable FieldMaskUtil

* revert back samples module

Author: stephaniewang526

samples/install-without-bom/pom.xml

@@ -33,6 +33,12 @@
     </dependency>
     <!-- [END bigquerydatatransfer_install_without_bom] -->
 
+    <dependency>
+      <groupId>com.google.protobuf</groupId>
+      <artifactId>protobuf-java-util</artifactId>
+      <version>3.13.0</version>
+    </dependency>
+
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>

samples/snapshot/pom.xml

@@ -32,6 +32,12 @@
     </dependency>
     <!-- {x-version-update-end} -->
 
+    <dependency>
+      <groupId>com.google.protobuf</groupId>
+      <artifactId>protobuf-java-util</artifactId>
+      <version>3.13.0</version>
+    </dependency>
+
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>

samples/snippets/pom.xml

@@ -44,6 +44,11 @@
     </dependency>
     <!-- [END bigquerydatatransfer_install_with_bom] -->
 
+    <dependency>
+      <groupId>com.google.protobuf</groupId>
+      <artifactId>protobuf-java-util</artifactId>
+    </dependency>
+
     <!-- Test dependencies -->
     <dependency>
       <groupId>junit</groupId>

samples/snippets/src/main/java/com/example/bigquerydatatransfer/UpdateTransferConfig.java

@@ -22,6 +22,7 @@
 import com.google.cloud.bigquery.datatransfer.v1.TransferConfig;
 import com.google.cloud.bigquery.datatransfer.v1.UpdateTransferConfigRequest;
 import com.google.protobuf.FieldMask;
+import com.google.protobuf.util.FieldMaskUtil;
 import java.io.IOException;
 
 // Sample to update transfer config.
@@ -40,7 +41,7 @@ public static void updateTransferConfig(String configId) throws IOException {
               .setName(configId)
               .setDisplayName("UPDATED_DISPLAY_NAME")
               .build();
-      FieldMask updateMask = FieldMask.newBuilder().addPaths("display_name").build();
+      FieldMask updateMask = FieldMaskUtil.fromString("display_name");
       UpdateTransferConfigRequest request =
           UpdateTransferConfigRequest.newBuilder()
               .setTransferConfig(transferConfig)