Add more components to the GN build.

components/infobars.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/infobars/core
       'target_name': 'infobars_core',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../skia/skia.gyp:skia',
         '../ui/gfx/gfx.gyp:gfx',
         '../ui/strings/ui_strings.gyp:ui_strings',
       ],
       'sources': [
+        # Note: sources duplicated in GN build.
         'infobars/core/confirm_infobar_delegate.cc',
         'infobars/core/confirm_infobar_delegate.h',
         'infobars/core/infobar.cc',
         'infobars/core/infobar.h',
         'infobars/core/infobar_android.cc',
         'infobars/core/infobar_container.cc',
         'infobars/core/infobar_container.h',
         'infobars/core/infobar_delegate.cc',
         'infobars/core/infobar_delegate.h',
         'infobars/core/infobar_manager.cc',
         'infobars/core/infobar_manager.h',
         'infobars/core/infobars_switches.cc',
         'infobars/core/infobars_switches.h',
       ],
     },
     {
+      # GN version: //components/infobars/test:test_support
       'target_name': 'infobars_test_support',
-     'type': 'static_library',
+      'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../skia/skia.gyp:skia',
       ],
       'sources': [
+        # Note: sources list duplicated in GN build.
         'infobars/test/infobar_test.cc',
       ],
     },
   ],
 }