[Tracing] Add hook to PartitionAlloc for heap profiling

third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/PartitionAllocMemoryDumpProvider.h"
 
 #include "public/platform/WebMemoryAllocatorDump.h"
 #include "public/platform/WebProcessMemoryDump.h"
 #include "wtf/Partitions.h"
@@ skipping 97 matching lines @@
 }
 
 PartitionAllocMemoryDumpProvider::PartitionAllocMemoryDumpProvider()
 {
 }
 
 PartitionAllocMemoryDumpProvider::~PartitionAllocMemoryDumpProvider()
 {
 }
 
+void PartitionAllocMemoryDumpProvider::onHeapProfilingEnabled(AllocationHook* allocationHook, FreeHook* freeHook)
+{
+    // Make PartitionAlloc call |allocationHook| and |freeHook| for every
+    // subsequent allocation and free (or not if the pointers are null).
+    PartitionAllocHooks::setAllocationHook(allocationHook);
+    PartitionAllocHooks::setFreeHook(freeHook);
+}
+
 } // namespace blink