[377375] Enable to generate WAV files by TTS engines

plugins/org.eclipse.actf.visualization.engines.voicebrowser/src/org/eclipse/actf/visualization/internal/engines/voicebrowser/DummyTTSEngine.java

diff --git a/plugins/org.eclipse.actf.visualization.engines.voicebrowser/src/org/eclipse/actf/visualization/internal/engines/voicebrowser/DummyTTSEngine.java b/plugins/org.eclipse.actf.visualization.engines.voicebrowser/src/org/eclipse/actf/visualization/internal/engines/voicebrowser/DummyTTSEngine.java
index 686969f..c899e96 100644
--- a/plugins/org.eclipse.actf.visualization.engines.voicebrowser/src/org/eclipse/actf/visualization/internal/engines/voicebrowser/DummyTTSEngine.java
+++ b/plugins/org.eclipse.actf.visualization.engines.voicebrowser/src/org/eclipse/actf/visualization/internal/engines/voicebrowser/DummyTTSEngine.java
@@ -11,6 +11,8 @@
 
 package org.eclipse.actf.visualization.internal.engines.voicebrowser;
 
+import java.io.File;
+
 import org.eclipse.actf.ai.tts.ITTSEngine;
 import org.eclipse.actf.ai.voice.IVoiceEventListener;
 
@@ -49,4 +51,12 @@
 		return false;
 	}
 
+	public boolean canSpeakToFile() {
+		return false;
+	}
+
+	public boolean speakToFile(String text, File file) {
+		return false;
+	}
+
 }