Extract protobuf database into a new 'leveldb_proto' component

components/leveldb_proto.gypi

+# Copyright (c) 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'leveldb_proto',
+      'type': 'static_library',
+      'include_dirs': [
+        '..',
+      ],
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
+      ],
+      'sources': [
+        'leveldb_proto/leveldb_database.cc',
+        'leveldb_proto/leveldb_database.h',
+        'leveldb_proto/proto_database.h',
+        'leveldb_proto/proto_database_impl.h',
+      ]
+    },
+    {
+      'target_name': 'leveldb_proto_test_support',
+      'type': 'static_library',
+      'dependencies': [
+        'leveldb_proto',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'leveldb_proto/testing/fake_db.h',
+        'leveldb_proto/testing/proto/test.proto',
+      ],
+      'variables': {
+        'proto_in_dir': 'leveldb_proto/testing/proto',
+        'proto_out_dir': 'components/leveldb_proto/testing/proto',
+      },
+      'includes': [ '../build/protoc.gypi' ]
+    },
+  ],
+}