Create a new RenderFrameHost per child frame when --site-per-process is enabled.

content/browser/web_contents/frame_tree_node.h

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_BROWSER_WEB_CONTENTS_FRAME_TREE_NODE_H_
-#define CONTENT_BROWSER_WEB_CONTENTS_FRAME_TREE_NODE_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_vector.h"
-#include "content/common/content_export.h"
-#include "url/gurl.h"
-
-namespace content {
-
-// Any page that contains iframes has a tree structure of the frames in the
-// renderer process. We are mirroring this tree in the browser process. This
-// class represents a node in this tree and is a wrapper for all objects that
-// are frame-specific (as opposed to page-specific).
-class CONTENT_EXPORT FrameTreeNode {
- public:
-  FrameTreeNode(int64 frame_id, const std::string& name);
-  ~FrameTreeNode();
-
-  // This method takes ownership of the child pointer.
-  void AddChild(FrameTreeNode* child);
-  void RemoveChild(int64 child_id);
-
-  int64 frame_id() const {
-    return frame_id_;
-  }
-
-  const std::string& frame_name() const {
-    return frame_name_;
-  }
-
-  size_t child_count() const {
-    return children_.size();
-  }
-
-  FrameTreeNode* child_at(size_t index) const {
-    return children_[index];
-  }
-
-  const GURL& current_url() const {
-    return current_url_;
-  }
-
-  void set_current_url(const GURL& url) {
-    current_url_ = url;
-  }
-
- private:
-  // The unique identifier for the frame in the page.
-  int64 frame_id_;
-
-  // The assigned name of the frame. This name can be empty, unlike the unique
-  // name generated internally in the DOM tree.
-  std::string frame_name_;
-
-  // The immediate children of this specific frame.
-  ScopedVector<FrameTreeNode> children_;
-
-  // Track the current frame's last committed URL, so we can estimate the
-  // process impact of out-of-process iframes.
-  // TODO(creis): Remove this when we can store subframe URLs in the
-  // NavigationController.
-  GURL current_url_;
-
-  DISALLOW_COPY_AND_ASSIGN(FrameTreeNode);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_WEB_CONTENTS_FRAME_TREE_NODE_H_