document.lastModified should consider user's local time zone

Source/core/html/forms/TimeInputType.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 55 matching lines @@
     countUsageIfVisible(UseCounter::InputTypeTime);
 }
 
 const AtomicString& TimeInputType::formControlType() const
 {
     return InputTypeNames::time;
 }
 
 Decimal TimeInputType::defaultValueForStepUp() const
 {
-    double current = currentTimeMS();
-    double utcOffset = calculateUTCOffset();
-    double dstOffset = calculateDSTOffset(current, utcOffset);
-    int offset = static_cast<int>((utcOffset + dstOffset) / msPerMinute);
-    current += offset * msPerMinute;
-
     DateComponents date;
-    date.setMillisecondsSinceMidnight(current);
+    date.setMillisecondsSinceMidnight(convertToLocalTime(currentTimeMS()));
     double milliseconds = date.millisecondsSinceEpoch();
     ASSERT(std::isfinite(milliseconds));
     return Decimal::fromDouble(milliseconds);
 }
 
 StepRange TimeInputType::createStepRange(AnyStepHandling anyStepHandling) const
 {
     DEFINE_STATIC_LOCAL(const StepRange::StepDescription, stepDescription, (timeDefaultStep, timeDefaultStepBase, timeStepScaleFactor, StepRange::ScaledStepValueShouldBeInteger));
 
     return InputType::createStepRange(anyStepHandling, timeDefaultStepBase, Decimal::fromDouble(DateComponents::minimumTime()), Decimal::fromDouble(DateComponents::maximumTime()), stepDescription);
@@ skipping 66 matching lines @@
         layoutParameters.maximum = DateComponents();
 }
 
 bool TimeInputType::isValidFormat(bool hasYear, bool hasMonth, bool hasWeek, bool hasDay, bool hasAMPM, bool hasHour, bool hasMinute, bool hasSecond) const
 {
     return hasHour && hasMinute && hasAMPM;
 }
 #endif
 
 } // namespace blink