Support the RTL mode of the message view.

Actions:
1) Force the menu view layer set layout direction as LTR to simplify the translation positioning and animations. Besides, the floating menu would also recover the last position when users turn it on.
2) Set the layout direction of the message view as LOCALE.

Bug: 244622119
Test: manual test
Change-Id: I5199305b1df39f88bd31307a58fd08390ec8120e

packages/SystemUI/src/com/android/systemui/accessibility/floatingmenu/MenuMessageView.java

@@ -61,6 +61,7 @@ class MenuMessageView extends LinearLayout implements
     MenuMessageView(Context context) {
         super(context);
 
+        setLayoutDirection(LAYOUT_DIRECTION_LOCALE);
         setVisibility(GONE);
 
         mTextView = new TextView(context);

packages/SystemUI/src/com/android/systemui/accessibility/floatingmenu/MenuViewLayer.java

@@ -150,6 +150,9 @@ class MenuViewLayer extends FrameLayout implements
             AccessibilityManager accessibilityManager, IAccessibilityFloatingMenu floatingMenu) {
         super(context);
 
+        // Simplifies the translation positioning and animations
+        setLayoutDirection(LAYOUT_DIRECTION_LTR);
+
         mWindowManager = windowManager;
         mAccessibilityManager = accessibilityManager;
         mFloatingMenu = floatingMenu;