Revert of Revert of [DevTools] Check request_id in DevToolsUIBindings::IndexPath

chrome/browser/devtools/devtools_ui_bindings.cc

 // Copyright 2014 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/browser/devtools/devtools_ui_bindings.h"
 
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram.h"
@@ skipping 559 matching lines @@
 
 void DevToolsUIBindings::IndexPath(int request_id,
                                    int index_request_id,
                                    const std::string& file_system_path) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   CHECK(web_contents_->GetURL().SchemeIs(content::kChromeDevToolsScheme));
   if (!file_helper_->IsFileSystemAdded(file_system_path)) {
     IndexingDone(index_request_id, file_system_path);
     return;
   }
+  if (indexing_jobs_.count(index_request_id) != 0)
+    return;
   indexing_jobs_[index_request_id] =
       scoped_refptr<DevToolsFileSystemIndexer::FileSystemIndexingJob>(
           file_system_indexer_->IndexPath(
               file_system_path,
               Bind(&DevToolsUIBindings::IndexingTotalWorkCalculated,
                    weak_factory_.GetWeakPtr(),
                    index_request_id,
                    file_system_path),
               Bind(&DevToolsUIBindings::IndexingWorked,
                    weak_factory_.GetWeakPtr(),
@@ skipping 327 matching lines @@
   if (frontend_loaded_)
     return;
   frontend_loaded_ = true;
 
   // Call delegate first - it seeds importants bit of information.
   delegate_->OnLoadCompleted();
 
   UpdateTheme();
   AddDevToolsExtensionsToClient();
 }