Add base::time::FromJavaTime

base/time/time.cc

Index: base/time/time.cc
diff --git a/base/time/time.cc b/base/time/time.cc
index 4e942015fcf578015138c7a824ea65ac6b416b8c..ba129954235f2c82db3f67ea4816540d87783ce8 100644
--- a/base/time/time.cc
+++ b/base/time/time.cc
@@ -203,6 +203,11 @@ double Time::ToJsTime() const {
           kMicrosecondsPerMillisecond);
 }
 
+Time Time::FromJavaTime(int64_t ms_since_epoch) {
+  return base::Time::UnixEpoch() +
+         base::TimeDelta::FromMilliseconds(ms_since_epoch);
+}
+
 int64_t Time::ToJavaTime() const {
   if (is_null()) {
     // Preserve 0 so the invalid result doesn't depend on the platform.