Record start up latency of DOM distiller viewer

components/dom_distiller/core/url_utils.h

Index: components/dom_distiller/core/url_utils.h
diff --git a/components/dom_distiller/core/url_utils.h b/components/dom_distiller/core/url_utils.h
index 71a7d5ce87a77debd76d2178f5d1478f39bee0af..8f6593617a65f46cbf83210a8fbf1f3a70a4cd1a 100644
--- a/components/dom_distiller/core/url_utils.h
+++ b/components/dom_distiller/core/url_utils.h
@@ -19,12 +19,17 @@ const GURL GetDistillerViewUrlFromEntryId(const std::string& scheme,
 
 // Returns the URL for viewing distilled content for a URL.
 const GURL GetDistillerViewUrlFromUrl(const std::string& scheme,
-                                      const GURL& view_url);
+                                      const GURL& view_url,
+                                      int64_t start_time_ms = 0);
 
 // Returns the original URL from the distilled URL.
 // If the URL is not distilled, it is returned as is.
 const GURL GetOriginalUrlFromDistillerUrl(const GURL& distilled_url);
 
+// Returns the starting time from the distilled URL.
+// Returns 0 when not available or on error.
+int64_t GetTimeFromDistillerUrl(const GURL& url);
+
 // Returns the value of the query parameter for the given |key| for a given URL.
 // If the URL is invalid or if the key is not found, returns an empty string.
 // If there are multiple keys found in the URL, returns the value for the first