[Chromoting] Implement new APIs in DesktopCapturer

remoting/protocol/fake_desktop_capturer.h

Index: remoting/protocol/fake_desktop_capturer.h
diff --git a/remoting/protocol/fake_desktop_capturer.h b/remoting/protocol/fake_desktop_capturer.h
index 074b5d6093fb90792265759555964c14e140ed33..5d0857e2987c4a83d0e5bc3936badca92d4e144b 100644
--- a/remoting/protocol/fake_desktop_capturer.h
+++ b/remoting/protocol/fake_desktop_capturer.h
@@ -41,6 +41,8 @@ class FakeDesktopCapturer : public webrtc::DesktopCapturer {
   void SetSharedMemoryFactory(std::unique_ptr<webrtc::SharedMemoryFactory>
                                   shared_memory_factory) override;
   void CaptureFrame() override;
+  bool GetSourceList(SourceList* sources) override;
+  bool SelectSource(SourceId id) override;
 
  private:
   FrameGenerator frame_generator_;