Perf test to measure loading CDM library.

chrome/browser/load_library_perf_test.cc

+// Copyright (c) 2014 The Chromium Authors. All rights reserved.

[Lei Zhang, 2014/02/12 20:25:06]

nit: no (c)

[shadi1, 2014/02/12 20:49:24]

Done.

+// 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));

[Lei Zhang, 2014/02/12 20:25:06]

I'd ASSERT_TRUE() here so you don't accidentally load the wrong library somehow.

[shadi1, 2014/02/12 20:49:24]

Done.

+  base::FilePath library_path = output_dir.Append(library_name);

[Lei Zhang, 2014/02/12 20:25:06]

Just use AppendASCII() so MeasureTimeToLoadNativeLibraryByBaseName() don't have
to do all these utf16 conversions.

[shadi1, 2014/02/12 20:49:24]

I wanted |library_name| to be a FilePath in case the library is within other
folders in DIR_MODULE, example inside lib folder. or did I misunderstood you?

[Lei Zhang, 2014/02/12 21:03:56]

Ok, that's fine. I thought it's just a simple name, in which case we can
simplify a little.

+  std::string error;
+  base::TimeTicks start = base::TimeTicks::HighResNow();
+  base::NativeLibrary native_library =

[Lei Zhang, 2014/02/12 20:25:06]

check this isn't null

[shadi1, 2014/02/12 20:49:24]

This was done in l.25 EXPECT_TRUE(native_library) << ...

But just realized that we can't UnloadLibrary() if it was null :)

I switched to ASSERT and moved it before the UnloadLibrary() call. This won't
report any time_to_load if it failed as well.

+      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);
+}
+
+// Use the base name of the library to dynamically get the platform specific
+// name. See base::GetNativeLibraryName() for details.
+void MeasureTimeToLoadNativeLibraryByBaseName(
+    const std::string& base_library_name) {
+  MeasureTimeToLoadNativeLibrary(base::FilePath::FromUTF16Unsafe(
+      base::GetNativeLibraryName(base::ASCIIToUTF16(base_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) {
+  MeasureTimeToLoadNativeLibraryByBaseName("clearkeycdm");
+}
+
+TEST(LoadCDMPerfTest, ExternalClearKeyAdapter) {
+  MeasureTimeToLoadNativeLibraryByBaseName("clearkeycdmadapter");
+}
+#endif  // defined(ENABLE_PEPPER_CDMS)