Add comment for search::MatchesOriginAndPath

chrome/common/search_urls.h

Index: chrome/common/search_urls.h
diff --git a/chrome/common/search_urls.h b/chrome/common/search_urls.h
index c4bbacd2db84718a4381636386d7c55e14564a2b..8840b5f2f1401226d69c17df97bd5b2373c90a59 100644
--- a/chrome/common/search_urls.h
+++ b/chrome/common/search_urls.h
@@ -9,7 +9,11 @@ class GURL;
 
 namespace search {
 
-// Returns true if |my_url| matches |other_url|.
+// Returns true if |my_url| matches |other_url| in terms of origin (i.e. host,
+// port, and scheme) and path. As a special case, this also matches if |my_url|
+// is "https://" and |other_url| is "http://" (and host, port, and path match).
+// This is so that "https://" URLs will be considered "Instant URLs" even if the
+// default search provider URL is "http://".
 bool MatchesOriginAndPath(const GURL& my_url, const GURL& other_url);
 
 }  // namespace search