Currently we only composite fixed position elements if we are on High DPI devices. This fix allows …

LayoutTests/compositing/rtl/rtl-fixed-overflow.html

Index: LayoutTests/compositing/rtl/rtl-fixed-overflow.html
diff --git a/LayoutTests/compositing/rtl/rtl-fixed-overflow.html b/LayoutTests/compositing/rtl/rtl-fixed-overflow.html
index 62f4c2011f2af320d59e1626a6e7662e11f1bc8b..b3e8066aa34fcf04adcae17046f6a6a7bc4b2123 100644
--- a/LayoutTests/compositing/rtl/rtl-fixed-overflow.html
+++ b/LayoutTests/compositing/rtl/rtl-fixed-overflow.html
@@ -16,11 +16,10 @@
     }
 
     .indicator {
-        background-color: red;
+        background-color: rgba(255, 0, 0, 0.99);
     }
 
     .layer {
-        transform:translateZ(0);
         background-color: green;
     }