Cleanup app snapshots on isolate/vm exit.

runtime/bin/extensions_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/extensions.h"
 #include "bin/utils.h"
 #include "bin/utils_win.h"
+#include "platform/assert.h"
 
 namespace dart {
 namespace bin {
 
 const char* kVmSnapshotDataSymbolName = "_kDartVmSnapshotData";
 const char* kVmSnapshotInstructionsSymbolName = "_kDartVmSnapshotInstructions";
 const char* kIsolateSnapshotDataSymbolName = "_kDartIsolateSnapshotData";
 const char* kIsolateSnapshotInstructionsSymbolName =
     "_kDartIsolateSnapshotInstructions";
 
-void* Extensions::LoadExtensionLibrary(const char* library_file) {
+void* Extensions::LoadLibrary(const char* library_file) {
   SetLastError(0);
 
   // Convert to wchar_t string.
   int name_len = MultiByteToWideChar(CP_UTF8, 0, library_file, -1, NULL, 0);
   wchar_t* name;
   name = new wchar_t[name_len];
   MultiByteToWideChar(CP_UTF8, 0, library_file, -1, name, name_len);
 
   void* ext = LoadLibraryW(name);
   delete[] name;
   return ext;
 }
 
 void* Extensions::ResolveSymbol(void* lib_handle, const char* symbol) {
   SetLastError(0);
   return GetProcAddress(reinterpret_cast<HMODULE>(lib_handle), symbol);
 }
 
+void Extensions::UnloadLibrary(void* lib_handle) {
+  BOOL result = FreeLibrary(reinterpret_cast<HMODULE>(lib_handle));
+  ASSERT(result);
+}
+
 Dart_Handle Extensions::GetError() {
   int last_error = GetLastError();
   if (last_error != 0) {
     OSError err;
     return Dart_NewApiError(err.message());
   }
   return Dart_Null();
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)