Print Preview component extension

chrome/browser/dom_ui/shared_resources_data_source.cc

 // Copyright (c) 2010 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/dom_ui/shared_resources_data_source.h"
 
 #include "app/resource_bundle.h"
 #include "base/singleton.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_thread.h"
@@ skipping 55 matching lines @@
     : DataSource(chrome::kChromeUIResourcesHost, NULL) {
 }
 
 SharedResourcesDataSource::~SharedResourcesDataSource() {
 }
 
 void SharedResourcesDataSource::StartDataRequest(const std::string& path,
                                                  bool is_off_the_record,
                                                  int request_id) {
   int idr = PathToIDR(path);
-  DCHECK_NE(-1, idr);
+  DCHECK_NE(-1, idr) << "Couldn't find shared resource: " << path;
   const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
   scoped_refptr<RefCountedStaticMemory> bytes(rb.LoadDataResourceBytes(idr));
   SendResponse(request_id, bytes);
 }
 
 std::string SharedResourcesDataSource::GetMimeType(
     const std::string& path) const {
   std::string mime_type;
   net::GetMimeTypeFromFile(FilePath().AppendASCII(path), &mime_type);
   return mime_type;
 }