Merge ScreenCapturerWinDirectx::frames_ and contexts_

webrtc/modules/desktop_capture/win/dxgi_context.cc

+/*
+ *  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 {
+
+DxgiAdapterContext::DxgiAdapterContext() = default;
+DxgiAdapterContext::DxgiAdapterContext(
+    const DxgiAdapterContext& context) = default;
+DxgiAdapterContext::~DxgiAdapterContext() = default;
+
+DxgiFrameContext::DxgiFrameContext() = default;
+
+DxgiFrameContext::~DxgiFrameContext() {
+  DxgiDuplicatorController::Instance()->Unregister(this);
+}
+
+void DxgiFrameContext::Reset() {
+  controller_id = 0;
+}
+
+}  // namespace webrtc