Update the Idle collector to do a full GC

src/heap.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 611 matching lines @@
 
   // Code that should be executed after the garbage collection proper.
   static void PostGarbageCollectionProcessing();
 
   // Performs garbage collection operation.
   // Returns whether required_space bytes are available after the collection.
   static bool CollectGarbage(int required_space, AllocationSpace space);
 
   // Performs a full garbage collection. Force compaction if the
   // parameter is true.
-  static void CollectAllGarbage(bool force_compaction = false);
+  static void CollectAllGarbage(bool force_compaction);
 
   // Performs a full garbage collection if a context has been disposed
   // since the last time the check was performed.
   static void CollectAllGarbageIfContextDisposed();
 
   // Notify the heap that a context has been disposed.
   static void NotifyContextDisposed();
 
   // Utility to invoke the scavenger. This is needed in test code to
   // ensure correct callback for weak global handles.
@@ skipping 189 matching lines @@
            > old_gen_promotion_limit_;
   }
 
   // True if we have reached the allocation limit in the old generation that
   // should artificially cause a GC right now.
   static bool OldGenerationAllocationLimitReached() {
     return (PromotedSpaceSize() + PromotedExternalMemorySize())
            > old_gen_allocation_limit_;
   }
 
+  // Can be called when the embedding application is idle.
+  static bool IdleNotification() {
+    static const int kIdlesBeforeCollection = 7;
+    static int number_idle_notifications = 0;
+    static int last_gc_count = gc_count_;
+
+    bool finished = false;
+
+    if (last_gc_count == gc_count_) {
+      number_idle_notifications++;
+    } else {
+      number_idle_notifications = 0;
+      last_gc_count = gc_count_;
+    }
+
+    if (number_idle_notifications >= kIdlesBeforeCollection) {
+      bool force_compaction = true;
+      CollectAllGarbage(force_compaction);
+      number_idle_notifications = 0;
+      finished = true;
+    }
+
+    // Uncommit unused memory in new space.
+    Heap::UncommitFromSpace();
+    return finished;
+  }
+
  private:
   static int semispace_size_;
   static int initial_semispace_size_;
   static int young_generation_size_;
   static int old_generation_size_;
 
   // For keeping track of how much data has survived
   // scavenge since last new space expansion.
   static int survived_since_last_expansion_;
 
@@ skipping 641 matching lines @@
   int marked_count_;
 
   // The count from the end of the previous full GC.  Will be zero if there
   // was no previous full GC.
   int previous_marked_count_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_