[heap] Make compaction space accept external memory.

src/heap/spaces-inl.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_SPACES_INL_H_
 #define V8_HEAP_SPACES_INL_H_
 
 #include "src/heap/spaces.h"
 #include "src/heap-profiler.h"
 #include "src/isolate.h"
@@ skipping 338 matching lines @@
       SkipList::Update(object->address(), size_in_bytes);
     }
     MSAN_ALLOCATED_UNINITIALIZED_MEMORY(object->address(), size_in_bytes);
     return object;
   }
 
   return AllocationResult::Retry(identity());
 }
 
 
+AllocationResult PagedSpace::AllocateRawUnalignedSynchronized(
+    int size_in_bytes) {
+  base::LockGuard<base::Mutex> lock_guard(&space_mutex_);
+  return AllocateRawUnaligned(size_in_bytes);
+}
+
+
 // Raw allocation.
 AllocationResult PagedSpace::AllocateRawAligned(int size_in_bytes,
                                                 AllocationAlignment alignment) {
   DCHECK(identity() == OLD_SPACE);
   int allocation_size = size_in_bytes;
   HeapObject* object = AllocateLinearlyAligned(&allocation_size, alignment);
 
   if (object == NULL) {
     // We don't know exactly how much filler we need to align until space is
     // allocated, so assume the worst case.
@@ skipping 108 matching lines @@
 
 
 intptr_t LargeObjectSpace::Available() {
   return ObjectSizeFor(heap()->isolate()->memory_allocator()->Available());
 }
 
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_SPACES_INL_H_