Add a metric to Chrome to measure fragmentation of chrome.dll at startup.BUG=98033TEST=None

chrome/browser/fragmentation_checker_unittest_win.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/file_path.h"
+#include "base/path_service.h"
+#include "chrome/browser/fragmentation_checker_win.h"
+#include "chrome/common/guid.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(FragmentationChecker, BasicCheck) {
+  FilePath module_path;
+  ASSERT_TRUE(PathService::Get(base::FILE_MODULE, &module_path));
+  int extent_count = fragmentation_checker::CountFileExtents(module_path);
+  EXPECT_GT(extent_count, 0);
+}
+
+TEST(FragmentationChecker, InvalidFile) {
+  FilePath module_path;
+  ASSERT_TRUE(PathService::Get(base::FILE_MODULE, &module_path));
+  module_path = module_path.DirName().AppendASCII(guid::GenerateGUID());
+  int extent_count = fragmentation_checker::CountFileExtents(module_path);
+  EXPECT_EQ(extent_count, 0);
+}