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 MeasureTimeToLoadNativeLibrary(const base::FilePath& library_name) {
+  base::FilePath output_dir;
+  EXPECT_TRUE(PathService::Get(base::DIR_MODULE, &output_dir));
+  base::FilePath library_path = output_dir.Append(library_name);
+  std::string error;
+  base::TimeTicks start = base::TimeTicks::HighResNow();
+  base::NativeLibrary native_library =
+      base::LoadNativeLibrary(library_path, &error);
+  double delta = (base::TimeTicks::HighResNow() - start).InMillisecondsF();
+  base::UnloadNativeLibrary(native_library);
+  EXPECT_TRUE(native_library) << "Error loading library:\n" << error;
+  perf_test::PrintResult("time_to_load_library",
+                         "",
+                         library_name.value(),
+                         delta,
+                         "ms",
+                         true);
+}
+
+void MeasureTimeToLoad(const std::string& short_library_name) {

[ddorwin, 2014/02/10 21:19:06]

nit: The name should probably be the same as the other function except some
reference to ShortName. MeasureTimeToLoadBy/ForShortName?

[shadi1, 2014/02/10 23:49:08]

Done.

+  MeasureTimeToLoadNativeLibrary(base::FilePath::FromUTF16Unsafe(
+      base::GetNativeLibraryName(base::ASCIIToUTF16(short_library_name))));
+}
+
+#if defined(ENABLE_PEPPER_CDMS)
+#if defined(WIDEVINE_CDM_AVAILABLE)
+TEST(LoadCDMPerfTest, Widevine) {
+  MeasureTimeToLoadNativeLibrary(
+      base::FilePath(FILE_PATH_LITERAL(kWidevineCdmFileName)));
+}
+
+TEST(LoadCDMPerfTest, WidevineAdapter) {
+  MeasureTimeToLoadNativeLibrary(
+      base::FilePath(FILE_PATH_LITERAL(kWidevineCdmAdapterFileName)));
+}
+#endif  // defined(WIDEVINE_CDM_AVAILABLE)
+
+TEST(LoadCDMPerfTest, ExternalClearKey) {
+  MeasureTimeToLoad("clearkeycdm");
+}
+
+TEST(LoadCDMPerfTest, ExternalClearKeyAdapter) {
+  MeasureTimeToLoad("clearkeycdmadapter");

[ddorwin, 2014/02/10 21:19:06]

This string (really the full name) appears in 3 other test files. The MIME type
appears in at least a couple. Should we have an external_clear_key_common.h?

The biggest question might be where to put it. Probably media/cdm/ if that is
reachable from all locations.

[shadi1, 2014/02/10 23:49:08]

True, a common file can make things cleaner. But probably outside the scope of
this CL.

+}
+#endif  // defined(ENABLE_PEPPER_CDMS)