media: Fix expiry time convertion from base::Time to JS time

media/blink/webcontentdecryptionmodulesession_impl.cc

Index: media/blink/webcontentdecryptionmodulesession_impl.cc
diff --git a/media/blink/webcontentdecryptionmodulesession_impl.cc b/media/blink/webcontentdecryptionmodulesession_impl.cc
index 5ef54ee04a23852103129e43096de01b8b4e4d3b..963e3c9ec3ac3cb7ea3e17e31448f678931a2fff 100644
--- a/media/blink/webcontentdecryptionmodulesession_impl.cc
+++ b/media/blink/webcontentdecryptionmodulesession_impl.cc
@@ -494,7 +494,11 @@ void WebContentDecryptionModuleSessionImpl::OnSessionKeysChange(
 void WebContentDecryptionModuleSessionImpl::OnSessionExpirationUpdate(
     base::Time new_expiry_time) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  client_->expirationChanged(new_expiry_time.ToJsTime());
+  // The check works around an issue in base::Time that converts null base::Time
+  // to |1601-01-01 00:00:00 UTC| in ToJsTime(). See http://crbug.com/679079
+  client_->expirationChanged(new_expiry_time.is_null()
+                                 ? std::numeric_limits<double>::quiet_NaN()
+                                 : new_expiry_time.ToJsTime());
 }
 
 void WebContentDecryptionModuleSessionImpl::OnSessionClosed() {