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

chrome/browser/media/router/media_source_helper.cc

Index: chrome/browser/media/router/media_source_helper.cc
diff --git a/chrome/browser/media/router/media_source_helper.cc b/chrome/browser/media/router/media_source_helper.cc
index 7c618b98484f291892191195998c60b5550a704d..fa410f8adb61ea8b86cc1fee35077b691005cbb1 100644
--- a/chrome/browser/media/router/media_source_helper.cc
+++ b/chrome/browser/media/router/media_source_helper.cc
@@ -24,6 +24,11 @@ constexpr char kTabRemotingUrnFormat[] =
     "urn:x-org.chromium.media:source:tab_content_remoting:%d";
 constexpr char kCastPresentationUrlDomain[] = "google.com";
 constexpr char kCastPresentationUrlPath[] = "/cast";
+
+// This value must be the same as |chrome.cast.AUTO_JOIN_PRESENTATION_ID| in the
+// component extension.
+constexpr char kAutoJoinPresentationId[] = "auto-join";
+
 }  // namespace
 
 MediaSource MediaSourceForTab(int tab_id) {
@@ -61,14 +66,11 @@ bool IsMirroringMediaSource(const MediaSource& source) {
 }
 
 bool CanConnectToMediaSource(const MediaSource& source) {
-  // compare host, port, scheme, and path prefix for source.url()
-  if (!source.url().SchemeIs(url::kHttpsScheme) ||
-      !source.url().DomainIs(kCastPresentationUrlDomain) ||
-      (!source.url().has_path() ||
-       source.url().path() != kCastPresentationUrlPath))
-    return false;
-
-  return true;
+  // Compare host, port, scheme, and path prefix for source.url().
+  return source.url().SchemeIs(url::kHttpsScheme) &&
+         source.url().DomainIs(kCastPresentationUrlDomain) &&
+         source.url().has_path() &&
+         source.url().path() == kCastPresentationUrlPath;
 }
 
 int TabIdFromMediaSource(const MediaSource& source) {
@@ -91,4 +93,8 @@ bool IsValidPresentationUrl(const GURL& url) {
   return url.is_valid() && url.SchemeIsHTTPOrHTTPS();
 }
 
+bool IsAutoJoinPresentationId(const std::string& presentation_id) {
+  return presentation_id == kAutoJoinPresentationId;
+}
+
 }  // namespace media_router