Add useTransportSecurity in ManagedChannelBuilder

core/src/main/java/io/grpc/ForwardingChannelBuilder.java

@@ -97,6 +97,12 @@ public T usePlaintext(boolean skipNegotiation) {
     return thisT();
   }
 
+  @Override
+  public T useTransportSecurity() {
+    delegate().useTransportSecurity();
+    return thisT();
+  }
+
   @Override
   public T nameResolverFactory(NameResolver.Factory resolverFactory) {
     delegate().nameResolverFactory(resolverFactory);

core/src/main/java/io/grpc/ManagedChannelBuilder.java

@@ -160,6 +160,18 @@ public static ManagedChannelBuilder<?> forTarget(String target) {
   @ExperimentalApi("https://github.com/grpc/grpc-java/issues/1772")
   public abstract T usePlaintext(boolean skipNegotiation);
 
+  /**
+   * Makes the client use TLS.
+   *
+   * @return this
+   * @throws UnsupportedOperationException if transport security is not supported.
+   * @since 1.9.0
+   */
+  @ExperimentalApi("https://github.com/grpc/grpc-java/issues/3713")
+  public T useTransportSecurity() {
+    throw new UnsupportedOperationException();
+  }
+
   /**
    * Provides a custom {@link NameResolver.Factory} for the channel. If this method is not called,
    * the builder will try the providers listed by {@link NameResolverProvider#providers()} for the

core/src/main/java/io/grpc/inprocess/InProcessChannelBuilder.java

@@ -79,6 +79,14 @@ public final InProcessChannelBuilder maxInboundMessageSize(int max) {
     return super.maxInboundMessageSize(max);
   }
 
+  /**
+   * Does nothing.
+   */
+  @Override
+  public InProcessChannelBuilder useTransportSecurity() {
+    return this;
+  }
+
   /**
    * Does nothing.
    */

netty/src/main/java/io/grpc/netty/NettyChannelBuilder.java

@@ -235,6 +235,15 @@ public NettyChannelBuilder usePlaintext(boolean skipNegotiation) {
     return this;
   }
 
+  /**
+   * Equivalent to using {@link #negotiationType(NegotiationType)} with {@code TLS}.
+   */
+  @Override
+  public NettyChannelBuilder useTransportSecurity() {
+    negotiationType(NegotiationType.TLS);
+    return this;
+  }
+
   /**
    * Enable keepalive with default delay and timeout.
    *

okhttp/src/main/java/io/grpc/okhttp/OkHttpChannelBuilder.java

@@ -301,6 +301,15 @@ public final OkHttpChannelBuilder usePlaintext(boolean skipNegotiation) {
     return this;
   }
 
+  /**
+   * Equivalent to using {@link #negotiationType(NegotiationType)} with {@code TLS}.
+   */
+  @Override
+  public final OkHttpChannelBuilder useTransportSecurity() {
+    negotiationType(NegotiationType.TLS);
+    return this;
+  }
+
   @Override
   @Internal
   protected final ClientTransportFactory buildTransportFactory() {