Record start up latency of DOM distiller viewer

components/dom_distiller/core/url_utils.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_DOM_DISTILLER_CORE_URL_UTILS_H_
 #define COMPONENTS_DOM_DISTILLER_CORE_URL_UTILS_H_
 
 #include <string>
 
 class GURL;
 
 namespace dom_distiller {
 
 namespace url_utils {
 
 // Returns the URL for viewing distilled content for an entry.
 const GURL GetDistillerViewUrlFromEntryId(const std::string& scheme,
                                           const std::string& entry_id);
 
 // 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
 // key.
 std::string GetValueForKeyInUrl(const GURL& url, const std::string& key);
 
 // Returns the value of the query parameter for the given path.
 std::string GetValueForKeyInUrlPathQuery(const std::string& path,
                                          const std::string& key);
 
 // Returns whether it should be possible to distill the given |url|.
 bool IsUrlDistillable(const GURL& url);
 
 // Returns whether the given |url| is for a distilled page.
 bool IsDistilledPage(const GURL& url);
 
 // Returns a JavaScript snippet that returns whether or not a page should be
 // used with DomDistillerService and can be executed in a live page.
 std::string GetIsDistillableJs();
 
 }  // namespace url_utils
 
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_CORE_URL_UTILS_H_