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

third_party/WebKit/Source/devtools/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("devtools.gypi") ],
                           "scope",
@@ skipping 49 matching lines @@
 all_devtools_files =
     gypi_values.devtools_cm_css_files + gypi_values.devtools_cm_js_files +
     devtools_core_files + gypi_values.devtools_module_json_files +
     devtools_modules_js_files + gypi_values.devtools_acorn_files
 
 # FIXME: Fix the generate_devtools_grd.py script to accept trailing slashes.
 resources_out_dir_no_slash = "$root_out_dir/resources/inspector"
 resources_out_dir = resources_out_dir_no_slash + "/"
 
 generated_scripts = [
-  resources_out_dir + "InspectorBackendCommands.js",
-  resources_out_dir + "SupportedCSSProperties.js",
+  resources_out_dir + "gen/InspectorBackendCommands.js",
+  resources_out_dir + "gen/SupportedCSSProperties.js",
 ]
 
 #-------------------------------------------------------------------------------
 
 visibility = [ "//third_party/WebKit/*" ]
 
 group("devtools_frontend_resources") {
   public_deps = [
     ":build_applications",
     ":copy_embedder_scripts",
@@ skipping 127 matching lines @@
 }
 
 action("supported_css_properties") {
   script = "scripts/generate_supported_css.py"
 
   inputs = [
     "../core/css/CSSProperties.in",
   ]
 
   outputs = [
-    resources_out_dir + "SupportedCSSProperties.js",
+    resources_out_dir + "gen/SupportedCSSProperties.js",
   ]
 
   args =
       rebase_path(inputs, root_build_dir) + rebase_path(outputs, root_build_dir)
 }
 
 action("frontend_protocol_sources") {
   script = "scripts/CodeGeneratorFrontend.py"
   deps = [
     "../core/inspector:protocol_version",
   ]
   inputs = [
     "$blink_core_output_dir/inspector/protocol.json",
   ]
   outputs = [
-    resources_out_dir + "InspectorBackendCommands.js",
+    resources_out_dir + "gen/InspectorBackendCommands.js",
   ]
 
   args = rebase_path(inputs, root_build_dir) + [
            "--output_js_dir",
            rebase_path(resources_out_dir, root_build_dir),
          ]
 }
 
 action("build_applications") {
   script = "scripts/build_applications.py"
@@ skipping 99 matching lines @@
   }
 
   copy("copy_codemirror_files") {
     sources =
         gypi_values.devtools_cm_js_files + gypi_values.devtools_cm_css_files
     outputs = [
       resources_out_dir + "cm/{{source_file_part}}",
     ]
   }
 }