Expose scroll containers via accessibility APIs.

Source/modules/accessibility/AXObject.h

Index: Source/modules/accessibility/AXObject.h
diff --git a/Source/modules/accessibility/AXObject.h b/Source/modules/accessibility/AXObject.h
index 10cedb4085a70b2c1cb2d8865cbe3549a0708c6f..46cd7789c9f95c9bd96f176e5c4ba9b31a056e7e 100644
--- a/Source/modules/accessibility/AXObject.h
+++ b/Source/modules/accessibility/AXObject.h
@@ -700,6 +700,16 @@ public:
     // Selected text.
     virtual PlainTextRange selectedTextRange() const { return PlainTextRange(); }
 
+    // Scrollable containers.
+    bool isScrollableContainer() const;
+    IntPoint scrollOffset() const;
+    IntPoint minimumScrollOffset() const;
+    IntPoint maximumScrollOffset() const;
+    void setScrollOffset(const IntPoint&) const;
+
+    // If this object itself scrolls, return its ScrollableArea.
+    virtual ScrollableArea* getScrollableAreaIfScrollable() const { return 0; }
+
     // Modify or take an action on an object.
     virtual void increment() { }
     virtual void decrement() { }
@@ -752,10 +762,6 @@ protected:
 
     virtual const AXObject* inheritsPresentationalRoleFrom() const { return 0; }
 
-    // If this object itself scrolls, return its ScrollableArea.
-    virtual ScrollableArea* getScrollableAreaIfScrollable() const { return 0; }
-    virtual void scrollTo(const IntPoint&) const { }
-
     bool nameFromContents() const;
 
     AccessibilityRole buttonRoleType() const;