Implement computedRole and computedName (behind a flag)

Source/modules/accessibility/AXSlider.h

Index: Source/modules/accessibility/AXSlider.h
diff --git a/Source/modules/accessibility/AXSlider.h b/Source/modules/accessibility/AXSlider.h
index c0fff17a00cc4a8dda713781d4cc47fd33240677..bfb4bd20ad364758b2fd0877216650788a4e6498 100644
--- a/Source/modules/accessibility/AXSlider.h
+++ b/Source/modules/accessibility/AXSlider.h
@@ -34,16 +34,17 @@
 
 namespace blink {
 
+class AXObjectCache;
 class HTMLInputElement;
 
 class AXSlider : public AXRenderObject {
 
 public:
-    static PassRefPtr<AXSlider> create(RenderObject*);
+    static PassRefPtr<AXSlider> create(RenderObject*, AXObjectCache*);
     virtual ~AXSlider() { }
 
 protected:
-    explicit AXSlider(RenderObject*);
+    explicit AXSlider(RenderObject*, AXObjectCache*);
 
 private:
     HTMLInputElement* element() const;
@@ -65,7 +66,7 @@ private:
 class AXSliderThumb final : public AXMockObject {
 
 public:
-    static PassRefPtr<AXSliderThumb> create();
+    static PassRefPtr<AXSliderThumb> create(AXObjectCache*);
     virtual ~AXSliderThumb() { }
 
     virtual AccessibilityRole roleValue() const override { return SliderThumbRole; }
@@ -73,7 +74,7 @@ public:
     virtual LayoutRect elementRect() const override;
 
 private:
-    AXSliderThumb();
+    AXSliderThumb(AXObjectCache*);
 
     virtual bool computeAccessibilityIsIgnored() const override;
 };