[Api] Add an idle time garbage collection callback flag to GCCallbackFlags.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 52266d50441059ddc4ba818874cdbd03b27b47bf..4446b87e1c2a739c3f68a6da4eb64a48ec54e36b 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -6186,6 +6186,8 @@ enum GCType {
  *   - kGCCallbackFlagCollectAllAvailableGarbage: The GC callback is called
  *     in a phase where V8 is trying to collect all available garbage
  *     (e.g., handling a low memory notification).
+ *   - kGCCallbackScheduleIdleCollectGarbage: The GC callback is called to
+ *     trigger an idle garbage collection.
  */
 enum GCCallbackFlags {
   kNoGCCallbackFlags = 0,
@@ -6194,6 +6196,7 @@ enum GCCallbackFlags {
   kGCCallbackFlagSynchronousPhantomCallbackProcessing = 1 << 3,
   kGCCallbackFlagCollectAllAvailableGarbage = 1 << 4,
   kGCCallbackFlagCollectAllExternalMemory = 1 << 5,
+  kGCCallbackScheduleIdleCollectGarbage = 1 << 6,
 };
 
 typedef void (*GCCallback)(GCType type, GCCallbackFlags flags);