Added unit tests for Trust Boundary for Service accounts. Updated. the trust boundary enabler env variable

Author: vverman

oauth2_http/java/com/google/auth/oauth2/ServiceAccountCredentials.java

@@ -1162,6 +1162,7 @@ public static class Builder extends GoogleCredentials.Builder {
     private int lifetime = DEFAULT_LIFETIME_IN_SECONDS;
     private boolean useJwtAccessWithScope = false;
     private boolean defaultRetriesEnabled = true;
+    private TrustBoundary trustBoundary;
 
     protected Builder() {}
 
@@ -1180,6 +1181,7 @@ protected Builder(ServiceAccountCredentials credentials) {
       this.lifetime = credentials.lifetime;
       this.useJwtAccessWithScope = credentials.useJwtAccessWithScope;
       this.defaultRetriesEnabled = credentials.defaultRetriesEnabled;
+      this.trustBoundary = credentials.getTrustBoundary();
     }
 
     @CanIgnoreReturnValue

samples/snippets/pom.xml

@@ -43,7 +43,7 @@
     <dependency>
       <groupId>com.google.auth</groupId>
       <artifactId>google-auth-library-oauth2-http</artifactId>
-      <version>1.35.0</version>
+        <version>1.35.0</version>
     </dependency>
 
 <!--    IAM dependency-->