Add missing DesktopCapturer methods.

DesktopCapturer is not a pure virtual interface, meaning that wrapping
implementations such as DesktopAndCursorConditionalComposer need to be
updated whenever a new method is added--the compiler will not give an
error in this case. This was the cause of the multi-monitor breakage
for relative pointer mode.

Change-Id: I5a37a0e1fc47bf72cf9ccc7810c9e17d0a418237
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063412
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Auto-Submit: Jamie Walch <jamiewalch@chromium.org>
Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742384}

remoting/host/desktop_and_cursor_conditional_composer.cc

@@ -69,4 +69,21 @@ void DesktopAndCursorConditionalComposer::SetExcludedWindow(
   capturer_->SetExcludedWindow(window);
 }
 
+bool DesktopAndCursorConditionalComposer::GetSourceList(SourceList* sources) {
+  return capturer_->GetSourceList(sources);
+}
+
+bool DesktopAndCursorConditionalComposer::SelectSource(SourceId id) {
+  return capturer_->SelectSource(id);
+}
+
+bool DesktopAndCursorConditionalComposer::FocusOnSelectedSource() {
+  return capturer_->FocusOnSelectedSource();
+}
+
+bool DesktopAndCursorConditionalComposer::IsOccluded(
+    const webrtc::DesktopVector& pos) {
+  return capturer_->IsOccluded(pos);
+}
+
 }  // namespace remoting

remoting/host/desktop_and_cursor_conditional_composer.h

@@ -35,6 +35,10 @@ class DesktopAndCursorConditionalComposer : public webrtc::DesktopCapturer {
                                   shared_memory_factory) override;
   void CaptureFrame() override;
   void SetExcludedWindow(webrtc::WindowId window) override;
+  bool GetSourceList(SourceList* sources) override;
+  bool SelectSource(SourceId id) override;
+  bool FocusOnSelectedSource() override;
+  bool IsOccluded(const webrtc::DesktopVector& pos) override;
 
  private:
   DesktopAndCursorConditionalComposer(