Add DesktopCapturer GetSourceList SelectSource FocusOnSelectedSource functions

webrtc/modules/desktop_capture/desktop_capturer.cc

+/*
+ *  Copyright (c) 2016 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/desktop_capturer.h"
+
+#include "webrtc/modules/desktop_capture/desktop_capture_options.h"
+#include "webrtc/modules/desktop_capture/screen_capturer_differ_wrapper.h"
+
+namespace webrtc {
+
+DesktopCapturer::~DesktopCapturer() = default;
+
+void DesktopCapturer::SetSharedMemoryFactory(
+    std::unique_ptr<SharedMemoryFactory> shared_memory_factory) {}
+
+void DesktopCapturer::SetExcludedWindow(WindowId window) {}
+
+bool DesktopCapturer::GetSourceList(SourceList* sources) {
+  return true;
+}
+
+bool DesktopCapturer::SelectSource(SourceId id) {
+  return false;
+}
+
+bool DesktopCapturer::FocusOnSelectedSource() {
+  return false;
+}
+
+}  // namespace webrtc