Add Javascript time methods to base::Time.

base/time_unittest.cc

Index: base/time_unittest.cc
diff --git a/base/time_unittest.cc b/base/time_unittest.cc
index cb1f839b5baa6adabcdd6bd4a6d66659b8d080aa..f89fc8bee3831f6c43125b61d57a021dd027f4aa 100644
--- a/base/time_unittest.cc
+++ b/base/time_unittest.cc
@@ -88,6 +88,16 @@ TEST_F(TimeTest, TimeT) {
   EXPECT_EQ(0, Time::FromTimeT(0).ToInternalValue());
 }
 
+// Test conversions to/from javascript time.
+TEST_F(TimeTest, JsTime) {
+  Time epoch = Time::FromJsTime(0.0);
+  EXPECT_EQ(epoch, Time::UnixEpoch());
+  Time t = Time::FromJsTime(700000.3);
+  EXPECT_EQ(700.0003, t.ToDoubleT());
+  t = Time::FromDoubleT(800.73);
+  EXPECT_EQ(800730.0, t.ToJsTime());
+}
+
 TEST_F(TimeTest, FromExplodedWithMilliseconds) {
   // Some platform implementations of FromExploded are liable to drop
   // milliseconds if we aren't careful.