Perf test to measure loading CDM library.

chrome/browser/load_library_perf_test.cc

+// Copyright (c) 2014 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/files/file_path.h"
+#include "base/path_service.h"
+#include "base/scoped_native_library.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/time/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/perf/perf_test.h"
+#include "widevine_cdm_version.h"  //  In SHARED_INTERMEDIATE_DIR.
+
+
+void MeasureTimeToLoad(const std::string& library_name) {
+  base::NativeLibrary native_library;
+  base::FilePath library_full_name;
+  library_full_name = base::FilePath::FromUTF16Unsafe(
+      base::GetNativeLibraryName(base::ASCIIToUTF16(library_name)));
+  base::FilePath output_dir;
+  EXPECT_TRUE(PathService::Get(base::DIR_MODULE, &output_dir));
+  base::FilePath library_path = output_dir.Append(library_full_name);
+  std::string error;
+  base::TimeTicks start = base::TimeTicks::HighResNow();
+  native_library = base::LoadNativeLibrary(library_path, &error);
+  double delta = (base::TimeTicks::HighResNow() - start).InMillisecondsF();
+  EXPECT_TRUE(native_library) << "Error loading library:\n" << error;
+  perf_test::PrintResult("time_to_load_library",
+                         "",
+                         library_full_name.value(),
+                         delta,
+                         "ms",
+                         true);
+}
+
+#if defined(ENABLE_PEPPER_CDMS)
+#if defined(WIDEVINE_CDM_AVAILABLE)
+TEST(LoadCDMPerfTest, Widevine) {
+  MeasureTimeToLoad("widevinecdm");

[ddorwin, 2014/02/08 01:26:59]

Should we load the ...adapter? It's the whole package that we really care about
in this case. For fun, we could even load both. :)

+}
+#endif  // defined(WIDEVINE_CDM_AVAILABLE)
+
+TEST(LoadCDMPerfTest, ExternalClearKey) {
+  MeasureTimeToLoad("clearkeycdm");
+}
+#endif  // defined(ENABLE_PEPPER_CDMS)