Create variations target that depends on base.

components/variations.gypi

Index: components/variations.gypi
===================================================================
--- components/variations.gypi	(revision 0)
+++ components/variations.gypi	(working copy)
@@ -0,0 +1,47 @@
+# 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': 'variations',
+      'type': 'static_library',
+      'include_dirs': [
+        '..',
+      ],
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../third_party/mt19937ar/mt19937ar.gyp:mt19937ar',
+        'variations_seed_proto',
+      ],
+      'sources': [
+        'variations/entropy_provider.cc',
+        'variations/entropy_provider.h',
+        'variations/metrics_util.cc',
+        'variations/metrics_util.h',
+        'variations/variations_associated_data.cc',
+        'variations/variations_associated_data.h',
+        'variations/variations_seed_processor.cc',
+        'variations/variations_seed_processor.h',
+      ],
+    },
+    {
+      # Protobuf compiler / generator for Chrome Variations seed.
+      'target_name': 'variations_seed_proto',
+      'type': 'static_library',
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'variations/proto/trials_seed.proto',
+        'variations/proto/study.proto',
+      ],
+      'variables': {
+        'proto_in_dir': 'variations/proto',
+        'proto_out_dir': 'components/variations/proto',
+      },
+      'includes': [ '../build/protoc.gypi' ]
+    },
+  ],
+}