[Windows Sandbox] MITIGATION_EXTENSION_POINT_DISABLE support for children.

sandbox/win/BUILD.gn

Index: sandbox/win/BUILD.gn
diff --git a/sandbox/win/BUILD.gn b/sandbox/win/BUILD.gn
index 89eaaed703df56f26c1f33563095aee89a2e1bba..60bb499af3d5f43fb9b97af0ace9277342808cbb 100644
--- a/sandbox/win/BUILD.gn
+++ b/sandbox/win/BUILD.gn
@@ -205,11 +205,14 @@ test("sbox_integration_tests") {
     "tests/common/test_utils.cc",
     "tests/common/test_utils.h",
     "tests/integration_tests/integration_tests.cc",
+    "tests/integration_tests/integration_tests_common.h",
     "tests/integration_tests/integration_tests_test.cc",
   ]
 
   deps = [
     ":sandbox",
+    ":sbox_integration_test_hook_dll",
+    ":sbox_integration_test_win_proc",
     "//base/test:test_support",
     "//testing/gtest",
   ]
@@ -217,6 +220,23 @@ test("sbox_integration_tests") {
   libs = [ "dxva2.lib" ]
 }
 
+loadable_module("sbox_integration_test_hook_dll") {
+  sources = [
+    "tests/integration_tests/hooking_dll.cc",
+    "tests/integration_tests/integration_tests_common.h",
+  ]
+}
+
+executable("sbox_integration_test_win_proc") {
+  sources = [
+    "tests/integration_tests/hooking_win_proc.cc",
+    "tests/integration_tests/integration_tests_common.h",
+  ]
+
+  configs -= [ "//build/config/win:console" ]
+  configs += [ "//build/config/win:windowed" ]
+}
+
 test("sbox_validation_tests") {
   sources = [
     "tests/common/controller.cc",