initial value for data_roaming based on carrier

1. new carrier config for default data roaming value
to support carrier specific feature: turn on data_roaming by default.

Bug: 36193933
Test: manual test
Change-Id: Ie4f3a0714059e1a7257c84802db475c92c17e1b3
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 9b3786e..45cf4ca 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -1066,6 +1066,13 @@
             "carrier_app_no_wake_signal_config";
 
     /**
+     * Default value for {@link Settings.Global#DATA_ROAMING}
+     * @hide
+     */
+    public static final String KEY_CARRIER_DEFAULT_DATA_ROAMING_ENABLED_BOOL =
+            "carrier_default_data_roaming_enabled_bool";
+
+    /**
      * Determines whether the carrier supports making non-emergency phone calls while the phone is
      * in emergency callback mode.  Default value is {@code true}, meaning that non-emergency calls
      * are allowed in emergency callback mode.
@@ -1621,6 +1628,7 @@
         sDefaults.putBoolean(KEY_CARRIER_NAME_OVERRIDE_BOOL, false);
         sDefaults.putString(KEY_CARRIER_NAME_STRING, "");
         sDefaults.putBoolean(KEY_SUPPORT_DIRECT_FDN_DIALING_BOOL, false);
+        sDefaults.putBoolean(KEY_CARRIER_DEFAULT_DATA_ROAMING_ENABLED_BOOL, false);
 
         // MMS defaults
         sDefaults.putBoolean(KEY_MMS_ALIAS_ENABLED_BOOL, false);