Focus handling - RTL support

- Support LEFT and RIGHT keys to work across workspaces when in RTL mode.
- Folder icons navigate correctly on DPAD_LEFT/RIGHT events
- Folder navigation across pages also works correctly
- Deleted dead code inside FocusHelper

b/20120358

Change-Id: I7f851cb7ed31f666a91b2f856458d7966ea5f712

src/com/android/launcher3/DeviceProfile.java

@@ -82,7 +82,7 @@ public class DeviceProfile {
     boolean isLandscape;
     boolean isTablet;
     boolean isLargeTablet;
-    boolean isLayoutRtl;
+    public boolean isLayoutRtl;
 
     boolean transposeLayoutWithOrientation;