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 fdaaaad2e83e0dff5ddd5295b85046c3436a7fa3..76b400e82b3f7856e0e56159146b8b962901ee23 100644
--- a/Source/modules/accessibility/AXObject.h
+++ b/Source/modules/accessibility/AXObject.h
@@ -677,6 +677,16 @@ 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() { }
@@ -729,10 +739,6 @@ 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 { }
-
     AccessibilityRole buttonRoleType() const;
 
     unsigned getLengthForTextRange() const { return text().length(); }