Implement elementsFromPoint

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1032 matching lines @@
 }
 
 WebRect WebViewImpl::computeBlockBounds(const WebRect& rect, bool ignoreClipping)
 {
     if (!mainFrameImpl())
         return WebRect();
 
     // Use the rect-based hit test to find the node.
     IntPoint point = mainFrameImpl()->frameView()->windowToContents(IntPoint(rect.x, rect.y));
     HitTestRequest::HitTestRequestType hitType = HitTestRequest::ReadOnly | HitTestRequest::Active | (ignoreClipping ? HitTestRequest::IgnoreClipping : 0);
+    // crbug.com/451914: This does not look correct: we're using a list-based
+    // hit test but only using the single element result.
     HitTestResult result = mainFrameImpl()->frame()->eventHandler().hitTestResultAtPoint(point, hitType, LayoutSize(rect.width, rect.height));
     result.setToShadowHostIfInUserAgentShadowRoot();
 
     Node* node = result.innerNonSharedNode();
     if (!node)
         return WebRect();
 
     // Find the block type node based on the hit node.
     // FIXME: This wants to walk composed tree with NodeRenderingTraversal::parent().
     while (node && (!node->renderer() || node->renderer()->isInline()))
@@ skipping 3486 matching lines @@
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 void WebViewImpl::forceNextWebGLContextCreationToFail()
 {
     WebGLRenderingContext::forceNextWebGLContextCreationToFail();
 }
 
 } // namespace blink