[MR] Cancel auto-switching from tab mirroring to Cast SDK at page navigation based on user pref

chrome/browser/media/router/media_source_helper.h

Index: chrome/browser/media/router/media_source_helper.h
diff --git a/chrome/browser/media/router/media_source_helper.h b/chrome/browser/media/router/media_source_helper.h
index f9356cd1073a4ca5d04d19b1fb189f407d921159..2006d0bfa92260bf250c7a7e26a9662cfafaaa4a 100644
--- a/chrome/browser/media/router/media_source_helper.h
+++ b/chrome/browser/media/router/media_source_helper.h
@@ -40,6 +40,9 @@ bool IsValidMediaSource(const MediaSource& source);
 // Returns true if |url| is a valid presentation URL.
 bool IsValidPresentationUrl(const GURL& url);
 
+// Returns true if |presentation_id| is an ID used by auto-join requests.
+bool IsAutoJoinPresentationId(const std::string& presentation_id);
+
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SOURCE_HELPER_H_