Add a UseCounter that measures the amount of memory used in PartitionAlloc

Source/wtf/PartitionAlloc.h

 /*
  * 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 649 matching lines @@
 }
 
 // N (or more accurately, N - sizeof(void*)) represents the largest size in
 // bytes that will be handled by a SizeSpecificPartitionAllocator.
 // Attempts to partitionAlloc() more than this amount will fail.
 template <size_t N>
 class SizeSpecificPartitionAllocator {
 public:
     static const size_t kMaxAllocation = N - kAllocationGranularity;
     static const size_t kNumBuckets = N / kAllocationGranularity;
-    void init() { partitionAllocInit(&m_partitionRoot, kNumBuckets, kMaxAllocation); }
+    void init()
+    {
+        partitionAllocInit(&m_partitionRoot, kNumBuckets, kMaxAllocation);

[Chris Evans, 2015/04/07 00:50:36]

Nit: we no longer need this whitespace-only chance?

+    }
     bool shutdown() { return partitionAllocShutdown(&m_partitionRoot); }
     ALWAYS_INLINE PartitionRoot* root() { return &m_partitionRoot; }
 private:
     PartitionRoot m_partitionRoot;
     PartitionBucket m_actualBuckets[kNumBuckets];
 };
 
 class PartitionAllocatorGeneric {
 public:
-    void init() { partitionAllocGenericInit(&m_partitionRoot); }
+    void init()
+    {
+        partitionAllocGenericInit(&m_partitionRoot);

[Chris Evans, 2015/04/07 00:50:36]

Same nit.

+    }
     bool shutdown() { return partitionAllocGenericShutdown(&m_partitionRoot); }
     ALWAYS_INLINE PartitionRootGeneric* root() { return &m_partitionRoot; }
 private:
     PartitionRootGeneric m_partitionRoot;
 };
 
 } // namespace WTF
 
 using WTF::SizeSpecificPartitionAllocator;
 using WTF::PartitionAllocatorGeneric;
 using WTF::PartitionRoot;
 using WTF::partitionAllocInit;
 using WTF::partitionAllocShutdown;
 using WTF::partitionAlloc;
 using WTF::partitionFree;
 using WTF::partitionAllocGeneric;
 using WTF::partitionFreeGeneric;
 using WTF::partitionReallocGeneric;
 using WTF::partitionAllocActualSize;
 using WTF::partitionAllocSupportsGetSize;
 using WTF::partitionAllocGetSize;
 
 #endif // WTF_PartitionAlloc_h