Support large objects in the serializer/deserializer.

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index f8d340f18278b3d5ded9deecfe24fe329634bdbe..6d8bff64d69f870fbc5719432805659c20adb4b4 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -2840,9 +2840,7 @@ AllocationResult LargeObjectSpace::AllocateRaw(int object_size,
     return AllocationResult::Retry(identity());
   }
 
-  if (Size() + object_size > max_capacity_) {
-    return AllocationResult::Retry(identity());
-  }
+  if (!CanAllocateSize(object_size)) return AllocationResult::Retry(identity());
 
   LargePage* page = heap()->isolate()->memory_allocator()->AllocateLargePage(
       object_size, this, executable);
@@ -2887,6 +2885,13 @@ AllocationResult LargeObjectSpace::AllocateRaw(int object_size,
 }
 
 
+void LargeObjectSpace::PrepareForDeserialization(int large_objects_total_size) {
+  if (CanAllocateSize(large_objects_total_size)) return;
+  heap()->CollectAllAvailableGarbage("prepare for deserialization");
+  if (!CanAllocateSize(large_objects_total_size)) FatalProcessOutOfMemory();
+}
+
+
 size_t LargeObjectSpace::CommittedPhysicalMemory() {
   if (!base::VirtualMemory::HasLazyCommits()) return CommittedMemory();
   size_t size = 0;