Introduce --remote-debugging-frontend switch for custom remote debugging front-end

chrome/browser/devtools/remote_debugging_server.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/browser/devtools/remote_debugging_server.h"
 
 #include <utility>
 
+#include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/history/top_sites_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/common/chrome_content_client.h"
 #include "chrome/common/chrome_paths.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/common/url_constants.h"
 #include "components/devtools_http_handler/devtools_http_handler.h"
 #include "components/devtools_http_handler/devtools_http_handler_delegate.h"
 #include "components/history/core/browser/top_sites.h"
 #include "components/version_info/version_info.h"
 #include "content/public/browser/devtools_frontend_host.h"
 #include "grit/browser_resources.h"
 #include "net/base/net_errors.h"
 #include "net/socket/tcp_server_socket.h"
 #include "ui/base/resource/resource_bundle.h"
 
@@ skipping 138 matching lines @@
     // bootstrap the connection process.
     bool result = PathService::Get(chrome::DIR_USER_DATA, &output_dir);
     DCHECK(result);
   }
 
   base::FilePath debug_frontend_dir;
 #if defined(DEBUG_DEVTOOLS)
   PathService::Get(chrome::DIR_INSPECTOR, &debug_frontend_dir);
 #endif
 
+  std::string frontend_url;
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kRemoteDebuggingFrontend)) {
+    frontend_url = chrome::kChromeUIDevToolsCustomURL;
+  }
+
   devtools_http_handler_.reset(new devtools_http_handler::DevToolsHttpHandler(
-      base::WrapUnique(new TCPServerSocketFactory(ip, port)), std::string(),
+      base::WrapUnique(new TCPServerSocketFactory(ip, port)), frontend_url,
       new ChromeDevToolsHttpHandlerDelegate(), output_dir, debug_frontend_dir,
       version_info::GetProductNameAndVersionForUserAgent(), ::GetUserAgent()));
 }
 
 RemoteDebuggingServer::~RemoteDebuggingServer() {
   // Ensure Profile is alive, because the whole DevTools subsystem
   // accesses it during shutdown.
   DCHECK(g_browser_process->profile_manager());
 }