Merge 106730 - Source/WebCore: Patch by Swapna P <spottabathini@innominds.com> on 2012-02-04

Source/WebCore/rendering/RenderLayer.cpp

Index: Source/WebCore/rendering/RenderLayer.cpp
===================================================================
--- Source/WebCore/rendering/RenderLayer.cpp	(revision 107432)
+++ Source/WebCore/rendering/RenderLayer.cpp	(working copy)
@@ -67,6 +67,7 @@
 #include "FrameView.h"
 #include "Gradient.h"
 #include "GraphicsContext.h"
+#include "HTMLFrameElement.h"
 #include "HTMLFrameOwnerElement.h"
 #include "HTMLNames.h"
 #include "HitTestingTransformState.h"
@@ -1542,20 +1543,31 @@
         }
     } else if (!parentLayer && renderer()->isBox() && renderBox()->canBeProgramaticallyScrolled()) {
         if (frameView) {
-            if (renderer()->document() && renderer()->document()->ownerElement() && renderer()->document()->ownerElement()->renderer()) {
-                LayoutRect viewRect = frameView->visibleContentRect();
-                LayoutRect r = getRectToExpose(viewRect, rect, alignX, alignY);
-                
-                LayoutUnit xOffset = r.x();
-                LayoutUnit yOffset = r.y();
-                // Adjust offsets if they're outside of the allowable range.
-                xOffset = max<LayoutUnit>(0, min(frameView->contentsWidth(), xOffset));
-                yOffset = max<LayoutUnit>(0, min(frameView->contentsHeight(), yOffset));
+            Element* ownerElement = 0;
+            if (renderer()->document())
+                ownerElement = renderer()->document()->ownerElement();
 
-                frameView->setScrollPosition(IntPoint(xOffset, yOffset));
-                parentLayer = renderer()->document()->ownerElement()->renderer()->enclosingLayer();
-                newRect.setX(rect.x() - frameView->scrollX() + frameView->x());
-                newRect.setY(rect.y() - frameView->scrollY() + frameView->y());
+            if (ownerElement && ownerElement->renderer()) {
+                HTMLFrameElement* frameElement = 0;
+
+                if (ownerElement->hasTagName(frameTag) || ownerElement->hasTagName(iframeTag))
+                    frameElement = static_cast<HTMLFrameElement*>(ownerElement);
+
+                if (frameElement && frameElement->scrollingMode() != ScrollbarAlwaysOff) {
+                    LayoutRect viewRect = frameView->visibleContentRect();
+                    LayoutRect exposeRect = getRectToExpose(viewRect, rect, alignX, alignY);
+
+                    LayoutUnit xOffset = exposeRect.x();
+                    LayoutUnit yOffset = exposeRect.y();
+                    // Adjust offsets if they're outside of the allowable range.
+                    xOffset = max<LayoutUnit>(0, min(frameView->contentsWidth(), xOffset));
+                    yOffset = max<LayoutUnit>(0, min(frameView->contentsHeight(), yOffset));
+
+                    frameView->setScrollPosition(IntPoint(xOffset, yOffset));
+                    parentLayer = ownerElement->renderer()->enclosingLayer();
+                    newRect.setX(rect.x() - frameView->scrollX() + frameView->x());
+                    newRect.setY(rect.y() - frameView->scrollY() + frameView->y());
+                }
             } else {
                 LayoutRect viewRect = frameView->visibleContentRect();
                 LayoutRect r = getRectToExpose(viewRect, rect, alignX, alignY);