[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 64d6e749ce6f9781b093bb1b32d737e1422876e8..6081b69a72ad1888ca8396739822c0dcdd1fe651 100644
--- a/chrome/browser/media/router/media_source_helper.h
+++ b/chrome/browser/media/router/media_source_helper.h
@@ -44,6 +44,9 @@ 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_