Report DOM partitionAlloc size to V8 GC.

Source/wtf/PartitionAlloc.cpp

 /*
  * Copyright (C) 2013 Google Inc. 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
@@ skipping 94 matching lines @@
     spinLockLock(&PartitionRootBase::gInitializedLock);
     if (!PartitionRootBase::gInitialized) {
         PartitionRootBase::gInitialized = true;
         // We mark the seed page as free to make sure it is skipped by our
         // logic to find a new active page.
         PartitionRootBase::gPagedBucket.activePagesHead = &PartitionRootGeneric::gSeedPage;
     }
     spinLockUnlock(&PartitionRootBase::gInitializedLock);
 
     root->initialized = true;
+    root->totalAllocationSize = 0;
     root->totalSizeOfSuperPages = 0;
     root->nextSuperPage = 0;
     root->nextPartitionPage = 0;
     root->nextPartitionPageEnd = 0;
     root->firstExtent = 0;
     root->currentExtent = 0;
 
     memset(&root->globalEmptyPageRing, '\0', sizeof(root->globalEmptyPageRing));
     root->globalEmptyPageRingIndex = 0;
 
@@ skipping 835 matching lines @@
     printf("total live: %zu bytes\n", totalLive);
     printf("total resident: %zu bytes\n", totalResident);
     printf("total freeable: %zu bytes\n", totalFreeable);
     fflush(stdout);
 }
 
 #endif // !NDEBUG
 
 } // namespace WTF