Stack sampling profiler: handle unloaded and unloading modules

base/scoped_native_library_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/scoped_native_library.h"
 #if defined(OS_WIN)
 #include "base/files/file_path.h"
 #endif
 
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 10 matching lines @@
   // becomes zero, i.e. function pointer is still valid if the DLL used
   // in this test is also used by another part of this executable.
   // So, this test uses "ddraw.dll", which is not used by Chrome at all but
   // installed on all versions of Windows.
   const char kFunctionName[] = "DirectDrawCreate";
   NativeLibrary native_library;
   {
     FilePath path(GetNativeLibraryName(L"ddraw"));
     native_library = LoadNativeLibrary(path, NULL);
     ScopedNativeLibrary library(native_library);
+    EXPECT_TRUE(library.is_valid());
+    EXPECT_EQ(native_library, library.get());
     FARPROC test_function =
         reinterpret_cast<FARPROC>(library.GetFunctionPointer(kFunctionName));
     EXPECT_EQ(0, IsBadCodePtr(test_function));
     EXPECT_EQ(
         GetFunctionPointerFromNativeLibrary(native_library, kFunctionName),
         test_function);
   }
   EXPECT_EQ(NULL,
             GetFunctionPointerFromNativeLibrary(native_library, kFunctionName));
 #endif
 }
 
 }  // namespace base