Use deadline in IdleNotification.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index ef01a5fdd9307cdfd2235aad70c95bdae3c23a0f..db42558ddca850b3b94fb997dfdb2ac4b7d36cc2 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4996,8 +4996,12 @@ class V8_EXPORT Isolate {
    * The idle_time_in_ms argument specifies the time V8 has to do reduce
    * the memory footprint. There is no guarantee that the actual work will be
    * done within the time limit.
+   * The deadline argument specifies the deadline V8 has to reduce
+   * the memory footprint. There is no guarantee that the actual work will be
+   * done within the time limit.
    */
   bool IdleNotification(int idle_time_in_ms);
+  bool IdleNotification(double deadline);
 
   /**
    * Optional notification that the system is running low on memory.