base::Time should correctly handle -epoch time values from Javascript

base/time/time_unittest.cc

Index: base/time/time_unittest.cc
diff --git a/base/time/time_unittest.cc b/base/time/time_unittest.cc
index 8906c3bee193e1b876ceb0627a3cc844693fca6a..f25315ff647139634fdd2d93a7430381b5154795 100644
--- a/base/time/time_unittest.cc
+++ b/base/time/time_unittest.cc
@@ -159,6 +159,15 @@ TEST_F(TimeTest, JsTime) {
   EXPECT_EQ(700.0003, t.ToDoubleT());
   t = Time::FromDoubleT(800.73);
   EXPECT_EQ(800730.0, t.ToJsTime());
+
+  // Correctly convert |- epoch offset| which is valid time in javascript.
+  Time minusEpoch = Time::FromJsTime(-11644473600000.0);
+  EXPECT_EQ(-11644473600000, minusEpoch.ToJsTime());
+
+  // Check conversion of boundary javascript time values.
+  // See http://www.ecma-international.org/ecma-262/6.0/#sec-timeclip
+  EXPECT_EQ(-8.46e15, Time::FromJsTime(-8.46e15).ToJsTime());
+  EXPECT_EQ(8.46e15, Time::FromJsTime(8.46e15).ToJsTime());
 }
 
 #if defined(OS_POSIX)