add mtlsEndpoint to ClientSettings.

Author: rmehta19

gax-java/gax/src/main/java/com/google/api/gax/rpc/ClientSettings.java

@@ -103,6 +103,10 @@ public final String getEndpoint() {
     return stubSettings.getEndpoint();
   }
 
+  public final String getMtlsEndpoint() {
+    return stubSettings.getMtlsEndpoint();
+  }
+
   public final String getQuotaProjectId() {
     return stubSettings.getQuotaProjectId();
   }
@@ -145,6 +149,7 @@ public String toString() {
         .add("clock", getClock())
         .add("universeDomain", getUniverseDomain())
         .add("endpoint", getEndpoint())
+        .add("mtlsEndpoint", getMtlsEndpoint())
         .add("quotaProjectId", getQuotaProjectId())
         .add("watchdogProvider", getWatchdogProvider())
         .add("watchdogCheckInterval", getWatchdogCheckInterval())
@@ -272,6 +277,11 @@ public B setEndpoint(String endpoint) {
       return self();
     }
 
+    public B setMtlsEndpoint(String mtlsEndpoint) {
+      stubSettings.setMtlsEndpoint(mtlsEndpoint);
+      return self();
+    }
+
     public B setQuotaProjectId(String quotaProjectId) {
       stubSettings.setQuotaProjectId(quotaProjectId);
       return self();
@@ -375,6 +385,10 @@ public String getEndpoint() {
       return stubSettings.getEndpoint();
     }
 
+    public String getMtlsEndpoint() {
+      return stubSettings.getMtlsEndpoint();
+    }
+
     /** Gets the QuotaProjectId that was previously set on this Builder. */
     public String getQuotaProjectId() {
       return stubSettings.getQuotaProjectId();
@@ -427,6 +441,7 @@ public String toString() {
           .add("internalHeaderProvider", getInternalHeaderProvider())
           .add("clock", getClock())
           .add("endpoint", getEndpoint())
+          .add("mtlsEndpoint", getMtlsEndpoint())
           .add("quotaProjectId", getQuotaProjectId())
           .add("watchdogProvider", getWatchdogProvider())
           .add("watchdogCheckInterval", getWatchdogCheckIntervalDuration())