Add a convenience function to Version

base/version_unittest.cc

 // Copyright (c) 2011 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 "base/memory/scoped_ptr.h"
 #include "base/version.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class VersionTest : public testing::Test {
 };
@@ skipping 67 matching lines @@
     {"1.1", "1.0.1", 1},
     {"1.1", "1.0.1", 1},
     {"1.0.0", "1.0", 0},
     {"1.0.3", "1.0.20", -1},
   };
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(cases); ++i) {
     scoped_ptr<Version> lhs(Version::GetVersionFromString(cases[i].lhs));
     scoped_ptr<Version> rhs(Version::GetVersionFromString(cases[i].rhs));
     EXPECT_EQ(lhs->CompareTo(*rhs), cases[i].expected) <<
           cases[i].lhs << " ? " << cases[i].rhs;
+
+    EXPECT_EQ(lhs->IsOlderThan(cases[i].rhs), (cases[i].expected == -1));
   }
 }