Add CreateWindowCapturer() and CreateScreenCapturer() in DesktopCapturer

webrtc/modules/desktop_capture/fake_desktop_capturer.h

 /*
  *  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.
  */
 
 #ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_FAKE_DESKTOP_CAPTURER_H_
 #define WEBRTC_MODULES_DESKTOP_CAPTURE_FAKE_DESKTOP_CAPTURER_H_
 
 #include <memory>
 #include <utility>
 
 #include "webrtc/modules/desktop_capture/desktop_capturer.h"
+#include "webrtc/modules/desktop_capture/desktop_capture_types.h"
 #include "webrtc/modules/desktop_capture/desktop_frame_generator.h"
 #include "webrtc/modules/desktop_capture/shared_desktop_frame.h"
 #include "webrtc/modules/desktop_capture/shared_memory.h"
 
 namespace webrtc {
 
 // A fake implementation of DesktopCapturer or its derived interfaces to
 // generate DesktopFrame for testing purpose.
 //
 // Consumers can provide a FrameGenerator instance to generate instances of
 // DesktopFrame to return for each Capture() function call.
 // If no FrameGenerator provided, FakeDesktopCapturer will always return a
 // nullptr DesktopFrame.
 //
 // Double buffering is guaranteed by the FrameGenerator. FrameGenerator
 // implements in desktop_frame_generator.h guarantee double buffering, they
 // creates a new instance of DesktopFrame each time.
 //
 // T must be DesktopCapturer or its derived interfaces.
 //
 // TODO(zijiehe): Remove template T once we merge ScreenCapturer and
 // WindowCapturer.
-template <typename T>
+template <typename T = DesktopCapturer>
 class FakeDesktopCapturer : public T {
  public:
   FakeDesktopCapturer()
       : callback_(nullptr),
         result_(DesktopCapturer::Result::SUCCESS),
         generator_(nullptr) {}
 
   ~FakeDesktopCapturer() override {}
 
   // Decides the result which will be returned in next Capture() callback.
@@ skipping 25 matching lines @@
     }
     callback_->OnCaptureResult(DesktopCapturer::Result::ERROR_PERMANENT,
                                nullptr);
   }
 
   void SetSharedMemoryFactory(
       std::unique_ptr<SharedMemoryFactory> shared_memory_factory) override {
     shared_memory_factory_ = std::move(shared_memory_factory);
   }
 
+  bool GetSourceList(DesktopCapturer::SourceList* sources) override {
+    sources->push_back({kWindowId, "A-Fake-DesktopCapturer-Window"});
+    sources->push_back({kScreenId});
+    return true;
+  }
+
+  bool SelectSource(DesktopCapturer::SourceId id) override {
+    return id == kWindowId || id == kScreenId || id == kFullDesktopScreenId;
+  }
+
  private:
+  static constexpr DesktopCapturer::SourceId kWindowId = 1378277495;
+  static constexpr DesktopCapturer::SourceId kScreenId = 1378277496;
+
   DesktopCapturer::Callback* callback_;
   std::unique_ptr<SharedMemoryFactory> shared_memory_factory_;
   DesktopCapturer::Result result_;
   DesktopFrameGenerator* generator_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_FAKE_DESKTOP_CAPTURER_H_