Add Mojo API for Blink hit testing

third_party/WebKit/Source/core/exported/WebNode.cpp

 /*
  * Copyright (C) 2009 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 27 matching lines @@
 #include "core/dom/NodeList.h"
 #include "core/dom/StaticNodeList.h"
 #include "core/dom/TagCollection.h"
 #include "core/dom/TaskRunnerHelper.h"
 #include "core/editing/EditingUtilities.h"
 #include "core/editing/serializers/Serialization.h"
 #include "core/events/Event.h"
 #include "core/exported/WebPluginContainerImpl.h"
 #include "core/html/HTMLCollection.h"
 #include "core/html/HTMLElement.h"
+#include "core/html/HTMLFrameOwnerElement.h"
 #include "core/layout/LayoutEmbeddedContent.h"
 #include "core/layout/LayoutObject.h"
 #include "platform/wtf/PtrUtil.h"
 #include "public/platform/WebString.h"
 #include "public/web/WebDOMEvent.h"
 #include "public/web/WebDocument.h"
 #include "public/web/WebElement.h"
 #include "public/web/WebElementCollection.h"
 
 namespace blink {
@@ skipping 34 matching lines @@
 }
 
 WebString WebNode::NodeValue() const {
   return private_->nodeValue();
 }
 
 WebDocument WebNode::GetDocument() const {
   return WebDocument(&private_->GetDocument());
 }
 
+WebFrame* WebNode::ContentFrame() const {
+  Frame* target_frame = nullptr;
+  if (private_->IsFrameOwnerElement())
+    target_frame = ToHTMLFrameOwnerElement(private_.Get())->ContentFrame();
+  else
+    target_frame = private_->GetDocument().GetFrame();
+  return WebFrame::FromFrame(target_frame);
+}
+
 WebNode WebNode::FirstChild() const {
   return WebNode(private_->firstChild());
 }
 
 WebNode WebNode::LastChild() const {
   return WebNode(private_->lastChild());
 }
 
 WebNode WebNode::PreviousSibling() const {
   return WebNode(private_->previousSibling());
@@ skipping 88 matching lines @@
 WebNode& WebNode::operator=(Node* node) {
   private_ = node;
   return *this;
 }
 
 WebNode::operator Node*() const {
   return private_.Get();
 }
 
 }  // namespace blink