Use largest supported date for cookies if timegm overflows

base/time/time_posix.cc

Index: base/time/time_posix.cc
diff --git a/base/time/time_posix.cc b/base/time/time_posix.cc
index ac0e99f7eb61b30de3eb16556f77869a8ee4704b..89a896ae4e8926433358181fab81c178c19f0b40 100644
--- a/base/time/time_posix.cc
+++ b/base/time/time_posix.cc
@@ -338,6 +338,16 @@ bool Time::FromExploded(bool is_local, const Exploded& exploded, Time* time) {
   return false;
 }
 
+Time Time::GetMaxPlatformTime() {
+  const int64_t max_seconds = (sizeof(SysTime) < sizeof(int64_t))
+                              ? std::numeric_limits<SysTime>::max()
+                              : std::numeric_limits<int32_t>::max();
+  int64_t milliseconds = max_seconds * kMillisecondsPerSecond;
+  milliseconds += (kMillisecondsPerSecond - 1);
+  return Time((milliseconds * kMicrosecondsPerMillisecond) +
+              kWindowsEpochDeltaMicroseconds);
+}
+
 // TimeTicks ------------------------------------------------------------------
 // static
 TimeTicks TimeTicks::Now() {