Revert of Moving HitTest function to DeprecatedPaintLayerStackingNode.

Source/core/paint/DeprecatedPaintLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 1617 matching lines @@
         // Intersect the fragment with our ancestor's background clip so that e.g., columns in an overflow:hidden block are
         // properly clipped by the overflow.
         fragment.intersect(ancestorClipRect.rect());
 
         // Now intersect with our pagination clip. This will typically mean we're just intersecting the dirty rect with the column
         // clip, so the column clip ends up being all we apply.
         fragment.intersect(fragment.paginationClip);
     }
 }
 
+static inline LayoutRect frameVisibleRect(LayoutObject* layoutObject)
+{
+    FrameView* frameView = layoutObject->document().view();
+    if (!frameView)
+        return LayoutRect();
+
+    return LayoutRect(frameView->visibleContentRect());
+}
+
+bool DeprecatedPaintLayer::hitTest(HitTestResult& result)
+{
+    return hitTest(result.hitTestRequest(), result.hitTestLocation(), result);
+}
+
+bool DeprecatedPaintLayer::hitTest(const HitTestRequest& request, const HitTestLocation& hitTestLocation, HitTestResult& result)
+{
+    ASSERT(isSelfPaintingLayer() || hasSelfPaintingLayerDescendant());
+
+    // LayoutView should make sure to update layout before entering hit testing
+    ASSERT(!layoutObject()->frame()->view()->layoutPending());
+    ASSERT(!layoutObject()->document().layoutView()->needsLayout());
+
+    // Start with frameVisibleRect to ensure we include the scrollbars.
+    LayoutRect hitTestArea = frameVisibleRect(layoutObject());
+    if (request.ignoreClipping())
+        hitTestArea.unite(LayoutRect(layoutObject()->view()->documentRect()));
+
+    DeprecatedPaintLayer* insideLayer = hitTestLayer(this, 0, result, hitTestArea, hitTestLocation, false);
+    if (!insideLayer) {
+        // We didn't hit any layer. If we are the root layer and the mouse is -- or just was -- down,
+        // return ourselves. We do this so mouse events continue getting delivered after a drag has
+        // exited the WebView, and so hit testing over a scrollbar hits the content document.
+        // In addtion, it is possible for the mouse to stay in the document but there is no element.
+        // At that time, the events of the mouse should be fired.
+        LayoutPoint hitPoint = hitTestLocation.point();
+        if (!request.isChildFrameHitTest() && ((request.active() || request.release()) || (request.move() && hitTestArea.contains(hitPoint.x(), hitPoint.y()))) && isRootLayer()) {
+            layoutObject()->updateHitTestResult(result, toLayoutView(layoutObject())->flipForWritingMode(hitTestLocation.point()));
+            insideLayer = this;
+        }
+    }
+
+    // Now determine if the result is inside an anchor - if the urlElement isn't already set.
+    Node* node = result.innerNode();
+    if (node && !result.URLElement())
+        result.setURLElement(node->enclosingLinkEventParentOrSelf());
+
+    // Now return whether we were inside this layer (this will always be true for the root
+    // layer).
+    return insideLayer;
+}
+
 Node* DeprecatedPaintLayer::enclosingElement() const
 {
     for (LayoutObject* r = layoutObject(); r; r = r->parent()) {
         if (Node* e = r->node())
             return e;
     }
     ASSERT_NOT_REACHED();
     return 0;
 }
 
@@ skipping 1266 matching lines @@
 
 void showLayerTree(const blink::LayoutObject* layoutObject)
 {
     if (!layoutObject) {
         fprintf(stderr, "Cannot showLayerTree. Root is (nil)\n");
         return;
     }
     showLayerTree(layoutObject->enclosingLayer());
 }
 #endif