Port "Eclipse CDT settings" file generation from GYP to GN

tools/gn/BUILD.gn

 # Copyright (c) 2013 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("//testing/test.gni")
 
 defines = [ "GN_BUILD" ]
 
 static_library("gn_lib") {
   configs += [ "//build/config:precompiled_headers" ]
@@ skipping 32 matching lines @@
     "config_values.cc",
     "config_values.h",
     "config_values_extractors.cc",
     "config_values_extractors.h",
     "config_values_generator.cc",
     "config_values_generator.h",
     "copy_target_generator.cc",
     "copy_target_generator.h",
     "deps_iterator.cc",
     "deps_iterator.h",
+    "eclipse_writer.cc",
+    "eclipse_writer.h",
     "err.cc",
     "err.h",
     "escape.cc",
     "escape.h",
     "exec_process.cc",
     "exec_process.h",
     "filesystem_utils.cc",
     "filesystem_utils.h",
     "function_exec_script.cc",
     "function_foreach.cc",
@@ skipping 242 matching lines @@
     "format_test_data/",
   ]
 
   deps = [
     ":gn_lib",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//testing/gtest",
   ]
 }