Create variations target that depends on base.

components/variations/metrics_util.cc

Index: components/variations/metrics_util.cc
===================================================================
--- components/variations/metrics_util.cc	(revision 0)
+++ components/variations/metrics_util.cc	(working copy)
@@ -0,0 +1,27 @@
+// Copyright 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.
+
+#include "components/variations/metrics_util.h"
+
+#include "base/sha1.h"
+#include "base/sys_byteorder.h"
+
+namespace metrics {
+
+uint32 HashName(const std::string& name) {
+  // SHA-1 is designed to produce a uniformly random spread in its output space,
+  // even for nearly-identical inputs.
+  unsigned char sha1_hash[base::kSHA1Length];
+  base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(name.c_str()),
+                      name.size(),
+                      sha1_hash);
+
+  uint32 bits;
+  COMPILE_ASSERT(sizeof(bits) < sizeof(sha1_hash), need_more_data);
+  memcpy(&bits, sha1_hash, sizeof(bits));
+
+  return base::ByteSwapToLE32(bits);
+}
+
+}  // namespace metrics