Add components and CLD to GN build.

components/autocomplete.gypi

 # 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.
 
 {
   'targets': [
     {
+      # GN version: //components/autocomplete
       'target_name': 'autocomplete',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
         '../net/net.gyp:net',
         '../url/url.gyp:url_lib',
         'component_metrics_proto',
         'url_fixer',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
+        # Note: sources list duplicated in GN build.
         'autocomplete/autocomplete_input.cc',
         'autocomplete/autocomplete_input.h',
         'autocomplete/autocomplete_scheme_classifier.h',
         'autocomplete/url_prefix.cc',
         'autocomplete/url_prefix.h',
       ],
     },
     {
+      # GN version: //components/autocomplete:test_support
       'target_name': 'autocomplete_test_support',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
         'autocomplete',
         'component_metrics_proto',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
+        # Note: sources list duplicated in GN build.
         'autocomplete/test_scheme_classifier.cc',
         'autocomplete/test_scheme_classifier.h',
       ],
     },
   ],
 }