[Tracing] Add hook to PartitionAlloc for heap profiling

third_party/WebKit/Source/wtf/PartitionAlloc.cpp

Index: third_party/WebKit/Source/wtf/PartitionAlloc.cpp
diff --git a/third_party/WebKit/Source/wtf/PartitionAlloc.cpp b/third_party/WebKit/Source/wtf/PartitionAlloc.cpp
index d076568fcfc59bd6984d319884c0c6c19b18d6af..322fe8872bebb8e79c5c2a67ae873c0a553eb3cf 100644
--- a/third_party/WebKit/Source/wtf/PartitionAlloc.cpp
+++ b/third_party/WebKit/Source/wtf/PartitionAlloc.cpp
@@ -60,6 +60,8 @@ bool PartitionRootBase::gInitialized = false;
 PartitionPage PartitionRootBase::gSeedPage;
 PartitionBucket PartitionRootBase::gPagedBucket;
 void (*PartitionRootBase::gOomHandlingFunction)() = nullptr;
+PartitionAllocHooks::AllocationHook* PartitionAllocHooks::m_allocationHook = nullptr;
+PartitionAllocHooks::FreeHook* PartitionAllocHooks::m_freeHook = nullptr;
 
 static uint16_t partitionBucketNumSystemPages(size_t size)
 {
@@ -1060,8 +1062,10 @@ void* partitionReallocGeneric(PartitionRootGeneric* root, void* ptr, size_t newS
         // We may be able to perform the realloc in place by changing the
         // accessibility of memory pages and, if reducing the size, decommitting
         // them.
-        if (partitionReallocDirectMappedInPlace(root, page, newSize))
+        if (partitionReallocDirectMappedInPlace(root, page, newSize)) {
+            PartitionAllocHooks::reallocHookIfEnabled(ptr, ptr, newSize);
             return ptr;
+        }
     }
 
     size_t actualNewSize = partitionAllocActualSize(root, newSize);