Add UMA stats for predicted process counts with out-of-process iframes.

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 <vector>
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
+#include "googleurl/src/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);
@@ skipping 12 matching lines @@
   }
 
   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.
   std::vector<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_