[Chromoting] Implement new APIs in DesktopCapturer

remoting/protocol/fake_desktop_capturer.cc

Index: remoting/protocol/fake_desktop_capturer.cc
diff --git a/remoting/protocol/fake_desktop_capturer.cc b/remoting/protocol/fake_desktop_capturer.cc
index 17b25c40e72a319941e354dcb7fd1f710a091e37..52cd4839cd419416231d90ddac70b67c315cd2ee 100644
--- a/remoting/protocol/fake_desktop_capturer.cc
+++ b/remoting/protocol/fake_desktop_capturer.cc
@@ -159,5 +159,13 @@ void FakeDesktopCapturer::CaptureFrame() {
       std::move(frame));
 }
 
+bool FakeDesktopCapturer::GetSourceList(SourceList* sources) {
+  return false;
+}
+
+bool FakeDesktopCapturer::SelectSource(SourceId id) {
+  return false;
+}
+
 }  // namespace protocol
 }  // namespace remoting