[Windows Sandbox] MITIGATION_EXTENSION_POINT_DISABLE support for children.

sandbox/win/tests/integration_tests/hooking_dll.cc

+// Copyright (c) 2016 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 <windows.h>
+#include <stdio.h>
+
+#pragma data_seg(".shared")
+BOOL hook_called = false;
+#pragma data_seg()
+#pragma comment(linker, "/SECTION:.shared,RWS")
+
+extern "C" __declspec(dllexport) BOOL WasHookCalled() {
+  return hook_called;
+}
+
+extern "C" __declspec(dllexport) LRESULT
+    HookProc(int code, WPARAM wParam, LPARAM lParam) {
+  // Supported versions of Windows do not require the HHOOK to be passed along.
+  hook_called = true;
+  return CallNextHookEx(NULL, code, wParam, lParam);
+}
+
+BOOL WINAPI DllMain(__in HINSTANCE hinstDLL,
+                    __in DWORD reason,
+                    __in LPVOID lpvReserved) {
+  return TRUE;
+}