Backport text-to-speech support.

platform/android/os_android.cpp

@@ -52,6 +52,7 @@
 
 #include "java_godot_io_wrapper.h"
 #include "java_godot_wrapper.h"
+#include "tts_android.h"
 
 const char *OS_Android::ANDROID_EXEC_PATH = "apk";
 
@@ -81,6 +82,34 @@ public:
 	virtual ~AndroidLogger() {}
 };
 
+bool OS_Android::tts_is_speaking() const {
+	return TTS_Android::is_speaking();
+}
+
+bool OS_Android::tts_is_paused() const {
+	return TTS_Android::is_paused();
+}
+
+Array OS_Android::tts_get_voices() const {
+	return TTS_Android::get_voices();
+}
+
+void OS_Android::tts_speak(const String &p_text, const String &p_voice, int p_volume, float p_pitch, float p_rate, int p_utterance_id, bool p_interrupt) {
+	TTS_Android::speak(p_text, p_voice, p_volume, p_pitch, p_rate, p_utterance_id, p_interrupt);
+}
+
+void OS_Android::tts_pause() {
+	TTS_Android::pause();
+}
+
+void OS_Android::tts_resume() {
+	TTS_Android::resume();
+}
+
+void OS_Android::tts_stop() {
+	TTS_Android::stop();
+}
+
 int OS_Android::get_video_driver_count() const {
 	return 2;
 }