[sync] Componentize sync: Part Final: Target 'sync' is now its own component

sync/protocol/sync_proto.gyp

-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Copyright 2012 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'sync_proto',
       'type': 'static_library',
+      'defines': [
+        'SYNC_IMPLEMENTATION',
+      ],
       'sources': [
         'app_notification_specifics.proto',
         'app_setting_specifics.proto',
         'app_specifics.proto',
         'autofill_specifics.proto',
         'bookmark_specifics.proto',
         'client_commands.proto',
         'client_debug_info.proto',
         'device_info_specifics.proto',
         'encryption.proto',
         'experiments_specifics.proto',
         'extension_setting_specifics.proto',
         'extension_specifics.proto',
         'get_updates_caller_info.proto',
         'history_delete_directive_specifics.proto',
         'nigori_specifics.proto',
         'password_specifics.proto',
         'preference_specifics.proto',
         'search_engine_specifics.proto',
         'session_specifics.proto',
         'sync.proto',
         'sync_enums.proto',
         'test.proto',
         'theme_specifics.proto',
         'typed_url_specifics.proto',
       ],
       'variables': {
         'proto_out_dir': 'sync/protocol',
+        'cc_generator_options': 'dllexport_decl=SYNC_EXPORT:',
+        'cc_include': 'sync_export.h',
       },
+      # Copies 'sync/base/sync_export.h' to 'cc_dir'. Required so that the
+      # 'SYNC_EXPORT' macro can be auto-added to the sync proto headers.
+      'copies': [{
+        'destination': '<(cc_dir)',
+        'files': ['../base/sync_export.h'],

[Ryan Sleevi, 2012/12/07 03:16:31]

You should not be depending on cc_dir here - that should be an implementation
detail of protoc.gypi. 

Instead:
'variables': {
  ...
  cc_include: "sync/base/protoc.gypi"
}
include_dirs: [ '../../' ]

That *SHOULD* be sufficient here.

[Raghu Simha, 2012/12/07 06:08:33]

Good call. Should be a lot cleaner now.

+      }],
       'includes': ['../../build/protoc.gypi'],
     },
   ],
 }