Fix layout mirroring. [DO NOT MERGE]

Change-Id: I7db398aa2d11dac1210e84922138f78f0c23bb9b
(cherry picked from commit a9090705ef)

tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/Layout.java

@@ -131,6 +131,7 @@ class Layout extends RelativeLayout {
         HardwareConfig hwConfig = getParams().getHardwareConfig();
         Density density = hwConfig.getDensity();
         boolean isRtl = Bridge.isLocaleRtl(getParams().getLocale());
+        setLayoutDirection(isRtl? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR);
 
         NavigationBar navBar = null;
         if (mBuilder.hasNavBar()) {