Roll up patch for running layout tests under Aura.

public/platform/default/WebThemeEngine.h

Index: public/platform/default/WebThemeEngine.h
diff --git a/public/platform/default/WebThemeEngine.h b/public/platform/default/WebThemeEngine.h
index 448836596fed9b93ec50c7d2005f23836583d3a8..4333baecc208cdb1140cb2cc419f84cf1c139055 100644
--- a/public/platform/default/WebThemeEngine.h
+++ b/public/platform/default/WebThemeEngine.h
@@ -71,11 +71,15 @@ public:
         StateHover,
         StateNormal,
         StatePressed,
+        StateFocused,
+        StateReadonly,
     };
 
     // Extra parameters for drawing the PartScrollbarHorizontalTrack and
     // PartScrollbarVerticalTrack.
     struct ScrollbarTrackExtraParams {
+        bool isBack; // Whether this is the 'back' part or the 'forward' part.
+
         // The bounds of the entire track, as opposed to the part being painted.
         int trackX;
         int trackY;
@@ -105,7 +109,9 @@ public:
         bool hasBorderRadius;
         int arrowX;
         int arrowY;
+        int arrowHeight;
         WebColor backgroundColor;
+        bool fillContentArea;
     };
 
     // Extra parameters for PartSliderTrack and PartSliderThumb