Implement (FORMAT_ELAPSED, LENGTH_LONG) in time_format

ui/base/l10n/time_format.h

 // Copyright (c) 2011 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 UI_BASE_L10N_TIME_FORMAT_H_
 #define UI_BASE_L10N_TIME_FORMAT_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "ui/base/ui_base_export.h"
@@ skipping 16 matching lines @@
   };
 
   enum Length {
     LENGTH_SHORT,  // Short format, e.g. in English: sec/min/hour/day.
     LENGTH_LONG,   // Long format, e.g. in English: second/minute/hour/day.
     LENGTH_COUNT   // Enum size counter, not a length.  Must be last.
   };
 
   // Return a localized string of approximate time duration, formatted as a
   // single number, e.g. in English "2 hours ago".  Currently, all combinations
-  // of format and length except (FORMAT_ELAPSED, LENGTH_LONG) are implemented
-  // but it's easy to add this, if required.
+  // of format and length are implemented.
   static base::string16 Simple(Format format,
                                Length length,
                                const base::TimeDelta& delta);
 
   // Return a localized string of more precise time duration, either formatted
   // as a single value or as two values: for a time delta of e.g. 2h19m either
   // "2 hours" or "2 hours and 19 minutes" could be returned in English.
   // Two-value output can be forced by setting |cutoff| to -1.  Single-value
   // output can be forced by using Simple() or setting |cutoff| to 0.
   // Otherwise, choice of format happens automatically and the value of |cutoff|
@@ skipping 41 matching lines @@
   static base::string16 RelativeDate(const base::Time& time,
                                      const base::Time* optional_midnight_today);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(TimeFormat);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_L10N_TIME_FORMAT_H_