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

chrome/browser/devtools/remote_debugging_server.cc

Index: chrome/browser/devtools/remote_debugging_server.cc
diff --git a/chrome/browser/devtools/remote_debugging_server.cc b/chrome/browser/devtools/remote_debugging_server.cc
index cf2750f276719814df20f9c2c79bcca07ccf5fa3..c0da8a673e96332d354dca4ab3a144e438073142 100644
--- a/chrome/browser/devtools/remote_debugging_server.cc
+++ b/chrome/browser/devtools/remote_debugging_server.cc
@@ -6,6 +6,7 @@
 
 #include <utility>
 
+#include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ -19,6 +20,8 @@
 #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"
@@ -177,8 +180,14 @@ RemoteDebuggingServer::RemoteDebuggingServer(const std::string& ip,
   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()));
 }