SkTime: return timezone information

include/core/SkTime.h

Index: include/core/SkTime.h
diff --git a/include/core/SkTime.h b/include/core/SkTime.h
index 51616d41c741f724ec365243a5aeab6d0ad26faa..a8656347aa610c45d3c155b478af5d7c0a25a66f 100644
--- a/include/core/SkTime.h
+++ b/include/core/SkTime.h
@@ -12,12 +12,16 @@
 
 #include "SkTypes.h"
 
+class SkString;
+
 /** \class SkTime
     Platform-implemented utilities to return time of day, and millisecond counter.
 */
 class SkTime {
 public:
     struct DateTime {
+        int16_t  fTimeZoneMinutes;  // The number of minutes that GetDateTime()
+                                    // is ahead of or behind UTC.
         uint16_t fYear;          //!< e.g. 2005
         uint8_t  fMonth;         //!< 1..12
         uint8_t  fDayOfWeek;     //!< 0..6, 0==Sunday
@@ -25,6 +29,8 @@ public:
         uint8_t  fHour;          //!< 0..23
         uint8_t  fMinute;        //!< 0..59
         uint8_t  fSecond;        //!< 0..59
+
+        void toISO8601(SkString* dst) const;
     };
     static void GetDateTime(DateTime*);