Adding new Settings.Secure properties for the Text-To-Speech functionality.

Those properties are secure to prevent applications from altering the user's settings without his knowledge.

core/java/android/provider/Settings.java

@@ -1923,6 +1923,29 @@ public final class Settings {
         public static final String ENABLED_ACCESSIBILITY_SERVICES =
             "enabled_accessibility_services";
 
+        /**
+         * Setting to always use the default text-to-speech settings regardless
+         * of the application settings.
+         * 1 = override application settings,
+         * 0 = use application settings (if specified).
+         */
+        public static final String TTS_USE_DEFAULTS = "tts_use_defaults";
+
+        /**
+         * Default text-to-speech engine speech rate. 100 = 1x
+         */
+        public static final String TTS_DEFAULT_RATE = "tts_default_rate";
+
+        /**
+         * Default text-to-speech engine pitch. 100 = 1x
+         */
+        public static final String TTS_DEFAULT_PITCH = "tts_default_pitch";
+
+        /**
+         * Default text-to-speech engine.
+         */
+        public static final String TTS_DEFAULT_SYNTH = "tts_default_synth";
+
         /**
          * Whether to notify the user of open networks.
          * <p>