1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/win/get_activation_factory.cc b/third_party/libwebrtc/rtc_base/win/get_activation_factory.cc
new file mode 100644
index 0000000000..b3be9abfa7
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/win/get_activation_factory.cc
@@ -0,0 +1,49 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rtc_base/win/get_activation_factory.h"
+
+#include <libloaderapi.h>
+#include <roapi.h>
+
+namespace {
+
+FARPROC LoadComBaseFunction(const char* function_name) {
+  static HMODULE const handle =
+      ::LoadLibraryExW(L"combase.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32);
+  return handle ? ::GetProcAddress(handle, function_name) : nullptr;
+}
+
+decltype(&::RoGetActivationFactory) GetRoGetActivationFactoryFunction() {
+  static decltype(&::RoGetActivationFactory) const function =
+      reinterpret_cast<decltype(&::RoGetActivationFactory)>(
+          LoadComBaseFunction("RoGetActivationFactory"));
+  return function;
+}
+
+}  // namespace
+
+namespace webrtc {
+
+bool ResolveCoreWinRTDelayload() {
+  return GetRoGetActivationFactoryFunction() &&
+         ResolveCoreWinRTStringDelayload();
+}
+
+HRESULT RoGetActivationFactoryProxy(HSTRING class_id,
+                                    const IID& iid,
+                                    void** out_factory) {
+  auto get_factory_func = GetRoGetActivationFactoryFunction();
+  if (!get_factory_func)
+    return E_FAIL;
+  return get_factory_func(class_id, iid, out_factory);
+}
+
+}  // namespace webrtc