Bring back ScriptDebugServer and associated machinery

sky/engine/bindings/core/idl.gni

 # 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("//sky/engine/bindings/idl.gni")
 import("//sky/engine/core/core.gni")
 
-# Don't actually read idl.gypi since that just defines variables in terms of
-# others, which gypi_to_gn doesn't handle.
-
 # IDL file lists; see: http://www.chromium.org/developers/web-idl-interfaces
 # Interface IDL files: generate individual bindings (includes testing)
 core_interface_idl_files =
   core_idl_files
 
 # Static IDL files
 core_static_interface_idl_files =
   core_idl_files
 
 core_static_dependency_idl_files =
@@ skipping 22 matching lines @@
 core_generated_idl_files =
   core_generated_dependency_idl_files
 
 # Dependency IDL files: don't generate individual bindings, but do process
 # in IDL dependency computation, and count as build dependencies
 # 'core_dependency_idl_files' is already used in engine/core, so avoid
 # collision
 core_all_dependency_idl_files =
   core_static_dependency_idl_files +
   core_generated_dependency_idl_files