[chromedriver] Send all OnConnected before any OnEvent when connected.

chrome/test/chromedriver/dom_tracker.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/test/chromedriver/dom_tracker.h"
 
 #include <utility>
 
 #include "base/json/json_writer.h"
 #include "base/logging.h"
@@ skipping 10 matching lines @@
 
 Status DomTracker::GetFrameIdForNode(
     int node_id, std::string* frame_id) {
   if (node_to_frame_map_.count(node_id) == 0)
     return Status(kUnknownError, "element is not a frame");
   *frame_id = node_to_frame_map_[node_id];
   return Status(kOk);
 }
 
 Status DomTracker::OnConnected() {
+  node_to_frame_map_.clear();
   // Fetch the root document node so that Inspector will push DOM node
   // information to the client.
   base::DictionaryValue params;
   return client_->SendCommand("DOM.getDocument", params);
 }
 
 void DomTracker::OnEvent(const std::string& method,
                          const base::DictionaryValue& params) {
   if (method == "DOM.setChildNodes") {
     const base::Value* nodes;
@@ skipping 36 matching lines @@
     return false;
   std::string frame_id;
   if (dict->GetString("frameId", &frame_id))
     node_to_frame_map_.insert(std::make_pair(node_id, frame_id));
 
   const base::Value* children;
   if (dict->Get("children", &children))
     return ProcessNodeList(children);
   return true;
 }