Introducing SavePackageId and SaveItemId as distinct IdType<...>-based types.

content/content_tests.gypi

 # 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.
 
 {
   'variables': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 649 matching lines @@
       'common/dwrite_font_platform_win_unittest.cc',
       'common/fileapi/file_system_util_unittest.cc',
       'common/font_warmup_win_unittest.cc',
       'common/gpu/client/gpu_memory_buffer_impl_shared_memory_unittest.cc',
       'common/gpu/gpu_channel_manager_unittest.cc',
       'common/gpu/gpu_channel_test_common.cc',
       'common/gpu/gpu_channel_test_common.h',
       'common/gpu/gpu_channel_unittest.cc',
       'common/host_discardable_shared_memory_manager_unittest.cc',
       'common/host_shared_bitmap_manager_unittest.cc',
+      'common/id_type_unittest.cc',
       'common/indexed_db/indexed_db_key_unittest.cc',
       'common/input/gesture_event_stream_validator_unittest.cc',
       'common/input/input_param_traits_unittest.cc',
       'common/input/touch_event_stream_validator_unittest.cc',
       'common/input/web_input_event_traits_unittest.cc',
       'common/inter_process_time_ticks_converter_unittest.cc',
       'common/mac/attributed_string_coder_unittest.mm',
       'common/mac/font_descriptor_unittest.mm',
       'common/one_writer_seqlock_unittest.cc',
       'common/origin_util_unittest.cc',
@@ skipping 1526 matching lines @@
                   'content_unittests_apk.isolate',
                 ],
               },
             ],
           },
         ],
       ],
     }],
   ],
 }