DevTools: introduce --custom-devtools-frontend flag.

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 1efded8c9bcd47b8679e3f84f1ee6cda7fdc73e3..836961946a408c1d6e681789946736849affca89 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"
@@ -18,6 +19,8 @@
 #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/version_info/version_info.h"
 #include "content/public/browser/devtools_agent_host.h"
 #include "content/public/browser/devtools_frontend_host.h"
@@ -108,9 +111,17 @@ RemoteDebuggingServer::RemoteDebuggingServer(const std::string& ip,
   PathService::Get(chrome::DIR_INSPECTOR_DEBUG, &debug_frontend_dir);
 #endif
 
+  std::string frontend_url;
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(
+          switches::kRemoteDebuggingFrontend)) {
+    frontend_url = chrome::kChromeUIDevToolsCustomURL;

[dgozman, 2016/10/30 03:14:46]

So, this relies on the remote browser to support this custom url? Sounds
strange.

[lushnikov, 2016/10/31 22:47:26]

Done.

+    if (command_line->HasSwitch(switches::kEnableDevToolsExperiments))
+        frontend_url += "?experiments=true";

[dgozman, 2016/10/30 03:14:46]

Can we make hosting browser to add all the parameters, e.g. remoteBase,
experiments, etc?

[lushnikov, 2016/10/31 22:47:26]

Done.

+  }
   content::DevToolsAgentHost::StartRemoteDebuggingServer(
       base::MakeUnique<TCPServerSocketFactory>(ip, port),
-      std::string(),
+      frontend_url,
       output_dir,
       debug_frontend_dir,
       version_info::GetProductNameAndVersionForUserAgent(),