Make chrome/common compile in GN

sync/protocol/BUILD.gn

Index: sync/protocol/BUILD.gn
diff --git a/sync/protocol/BUILD.gn b/sync/protocol/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..de4376f382df103aad5c11eb36e1a1fa26802f14
--- /dev/null
+++ b/sync/protocol/BUILD.gn
@@ -0,0 +1,56 @@
+# 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.
+
+import("//third_party/protobuf/proto_library.gni")
+
+proto_library("protocol") {
+  sources = [
+    "app_notification_specifics.proto",
+    "app_setting_specifics.proto",
+    "app_specifics.proto",
+    "app_list_specifics.proto",
+    "article_specifics.proto",
+    "attachments.proto",
+    "autofill_specifics.proto",
+    "bookmark_specifics.proto",
+    "client_commands.proto",
+    "client_debug_info.proto",
+    "device_info_specifics.proto",
+    "dictionary_specifics.proto",
+    "encryption.proto",
+    "experiments_specifics.proto",
+    "extension_setting_specifics.proto",
+    "extension_specifics.proto",
+    "favicon_image_specifics.proto",
+    "favicon_tracking_specifics.proto",
+    "get_updates_caller_info.proto",
+    "history_delete_directive_specifics.proto",
+    "nigori_specifics.proto",
+    "managed_user_setting_specifics.proto",
+    "managed_user_shared_setting_specifics.proto",
+    "managed_user_specifics.proto",
+    "password_specifics.proto",
+    "preference_specifics.proto",
+    "priority_preference_specifics.proto",
+    "search_engine_specifics.proto",
+    "session_specifics.proto",
+    "sync.proto",
+    "sync_enums.proto",
+    "synced_notification_app_info_specifics.proto",
+    "synced_notification_data.proto",
+    "synced_notification_render.proto",
+    "synced_notification_specifics.proto",
+    "test.proto",
+    "theme_specifics.proto",
+    "typed_url_specifics.proto",
+    "unique_position.proto",
+  ]
+
+  cc_generator_options = "dllexport_decl=SYNC_EXPORT:"
+  cc_include = "sync/base/sync_export.h"
+
+  defines = [ "SYNC_IMPLEMENTATION" ]
+
+  extra_configs = [ "//build/config/compiler:wexit_time_destructors" ]
+}