GN: Use lib.unstripped rather than lib.stripped. Add a toolchain.gni

mandoline/services/core_services/BUILD.gn

 # Copyright 2015 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.
 #
 # core_services should be thought of as a bundle of many of the services which
 # we ship with.
 
 import("//build/config/ui.gni")
+import("//build/toolchain/toolchain.gni")
 import("//mojo/public/mojo_application.gni")
 
 mojo_native_application("core_services") {
   deps = [
     ":sources",
     "//third_party/angle:libEGL",
     "//third_party/angle:libGLESv2",
   ]
   if (is_win) {
     copy("copy_files") {
       sources = [
-        "$root_out_dir/libEGL.dll",
-        "$root_out_dir/libGLESv2.dll",
+        "$root_shlib_dir/libEGL.dll",
+        "$root_shlib_dir/libGLESv2.dll",
       ]
       outputs = [
         "$root_out_dir/core_services/{{source_file_part}}",
       ]
     }
     deps += [ ":copy_files" ]
   }
 
   if (!is_android) {
     deps += [ "//third_party/icu:icudata" ]
@@ skipping 27 matching lines @@
     ]
   }
 
   if (use_aura) {
     deps += [
       "//components/view_manager/public/cpp",
       "//mandoline/ui/omnibox:lib",
     ]
   }
 }