Android: Added new key codes without mapping.

src/video/android/SDL_androidkeyboard.c

@@ -300,6 +300,22 @@ static SDL_Scancode Android_Keycodes[] = {
     SDL_SCANCODE_UNKNOWN, /* AKEYCODE_TV_MEDIA_CONTEXT_MENU */
     SDL_SCANCODE_UNKNOWN, /* AKEYCODE_TV_TIMER_PROGRAMMING */
     SDL_SCANCODE_HELP, /* AKEYCODE_HELP */
+    SDL_SCANCODE_UNKNOWN, /* AKEYCODE_NAVIGATE_PREVIOUS */
+    SDL_SCANCODE_UNKNOWN, /* AKEYCODE_NAVIGATE_NEXT */
+    SDL_SCANCODE_UNKNOWN, /* AKEYCODE_NAVIGATE_IN */
+    SDL_SCANCODE_UNKNOWN, /* AKEYCODE_NAVIGATE_OUT */
+    SDL_SCANCODE_UNKNOWN,
+    SDL_SCANCODE_UNKNOWN,
+    SDL_SCANCODE_UNKNOWN,
+    SDL_SCANCODE_UNKNOWN,
+    SDL_SCANCODE_UNKNOWN,
+    SDL_SCANCODE_UNKNOWN,
+    SDL_SCANCODE_UNKNOWN,
+    SDL_SCANCODE_UNKNOWN,
+    SDL_SCANCODE_UNKNOWN, /* AKEYCODE_MEDIA_SKIP_FORWARD */
+    SDL_SCANCODE_UNKNOWN, /* AKEYCODE_MEDIA_SKIP_BACKWARD */
+    SDL_SCANCODE_UNKNOWN, /* AKEYCODE_MEDIA_STEP_FORWARD */
+    SDL_SCANCODE_UNKNOWN, /* AKEYCODE_MEDIA_STEP_BACKWARD */
 };
 
 static SDL_Scancode