Move navigation and frame tree classes to a new frame_host/ directory.

content/browser/renderer_host/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_ptr.h"
-#include "base/memory/scoped_vector.h"
-#include "content/common/content_export.h"
-#include "url/gurl.h"
-
-namespace content {
-
-class RenderFrameHostImpl;
-
-// When a page contains iframes, its renderer process maintains a tree structure
-// of those frames. 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:
-  static const int64 kInvalidFrameId;
-
-  FrameTreeNode(int64 frame_id, const std::string& name,
-                scoped_ptr<RenderFrameHostImpl> render_frame_host);
-  ~FrameTreeNode();
-
-  void AddChild(scoped_ptr<FrameTreeNode> child);
-  void RemoveChild(int64 child_id);
-
-  // Transitional API allowing the RenderFrameHost of a FrameTreeNode
-  // representing the main frame to be provided by someone else. After
-  // this is called, the FrameTreeNode no longer owns its RenderFrameHost.
-  //
-  // This should only be used for the main frame (aka root) in a frame tree.
-  //
-  // TODO(ajwong): Remove this method once the main frame RenderFrameHostImpl is
-  // no longer owned by the RenderViewHostImpl.
-  void ResetForMainFrame(RenderFrameHostImpl* new_render_frame_host);
-
-  void set_frame_id(int64 frame_id) {
-    DCHECK_EQ(frame_id_, kInvalidFrameId);
-    frame_id_ = frame_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;
-  }
-
-  RenderFrameHostImpl* render_frame_host() const {
-    return render_frame_host_;
-  }
-
- 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_;
-
-  // When ResetForMainFrame() is called, this is set to false and the
-  // |render_frame_host_| below is not deleted on destruction.
-  //
-  // For the mainframe, the FrameTree does not own the |render_frame_host_|.
-  // This is a transitional wart because RenderViewHostManager does not yet
-  // have the bookkeeping logic to handle creating a pending RenderFrameHost
-  // along with a pending RenderViewHost. Thus, for the main frame, the
-  // RenderViewHost currently retains ownership and the FrameTreeNode should
-  // not delete it on destruction.
-  bool owns_render_frame_host_;
-
-  // The active RenderFrameHost for this frame. The FrameTreeNode does not
-  // always own this pointer.  See comments above |owns_render_frame_host_|.
-  // TODO(ajwong): Replace with RenderFrameHostManager.
-  RenderFrameHostImpl* render_frame_host_;
-
-  // 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_