Added Back icon on SetSupportMessageActivity.

Test: manual verification
Fixes: 185247110

Change-Id: I664997298283733132ba3715d8c9601f9b6f8472
diff --git a/apps/CtsVerifier/src/com/android/cts/verifier/managedprovisioning/SetSupportMessageActivity.java b/apps/CtsVerifier/src/com/android/cts/verifier/managedprovisioning/SetSupportMessageActivity.java
index 9aa71a8..e116b41 100644
--- a/apps/CtsVerifier/src/com/android/cts/verifier/managedprovisioning/SetSupportMessageActivity.java
+++ b/apps/CtsVerifier/src/com/android/cts/verifier/managedprovisioning/SetSupportMessageActivity.java
@@ -16,6 +16,7 @@
 
 package com.android.cts.verifier.managedprovisioning;
 
+import android.app.ActionBar;
 import android.app.Activity;
 import android.app.admin.DevicePolicyManager;
 import android.content.ComponentName;
@@ -46,7 +47,12 @@
         findViewById(R.id.set_default_message).setOnClickListener(this);
         findViewById(R.id.set_message).setOnClickListener(this);
         findViewById(R.id.clear_message).setOnClickListener(this);
-        mSupportMessage = (EditText) findViewById(R.id.message_view);
+        mSupportMessage = findViewById(R.id.message_view);
+
+        ActionBar actBar = getActionBar();
+        if (actBar != null) {
+            actBar.setDisplayHomeAsUpEnabled(true);
+        }
 
         mType = getIntent().getStringExtra(EXTRA_SUPPORT_MSG_TYPE);
         setTitle(TYPE_SHORT_MSG.equals(mType)