Merge ScreenCapturerWinDirectx::frames_ and contexts_

webrtc/modules/desktop_capture/win/dxgi_context.cc

Index: webrtc/modules/desktop_capture/win/dxgi_context.cc
diff --git a/webrtc/modules/desktop_capture/win/dxgi_context.cc b/webrtc/modules/desktop_capture/win/dxgi_context.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5179f3e7b3995d1a5e89249d613e40462c254339
--- /dev/null
+++ b/webrtc/modules/desktop_capture/win/dxgi_context.cc
@@ -0,0 +1,30 @@
+/*
+ *  Copyright (c) 2017 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 "webrtc/modules/desktop_capture/win/dxgi_context.h"
+#include "webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.h"
+
+namespace webrtc {
+
+AdapterContext::AdapterContext() = default;
+AdapterContext::AdapterContext(const AdapterContext& context) = default;
+AdapterContext::~AdapterContext() = default;
+
+Context::Context() = default;
+
+Context::~Context() {
+  DxgiDuplicatorController::Instance()->Unregister(this);
+}
+
+void Context::Reset() {
+  controller_id = 0;
+}
+
+}  // namespace webrtc