Forward capturer_id between DesktopFrame and its implementations

webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc

Index: webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc
diff --git a/webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc b/webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc
index f5b85e40aa0eb6abba55e76b5be656c684aab7b2..d9d4b122157fea402ee57eb8aeafeac6ed870f36 100644
--- a/webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc
+++ b/webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc
@@ -81,6 +81,7 @@ DesktopFrameWithCursor::DesktopFrameWithCursor(
                    frame->shared_memory()) {
   set_dpi(frame->dpi());
   set_capture_time_ms(frame->capture_time_ms());
+  set_capturer_id(frame->capturer_id());
   mutable_updated_region()->Swap(frame->mutable_updated_region());
   original_frame_ = std::move(frame);