Enable sharding of AllocationRegister on desktop.

third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.h

 // 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.
 
 #ifndef PartitionAllocMemoryDumpProvider_h
 #define PartitionAllocMemoryDumpProvider_h
 
 #include "base/trace_event/memory_dump_provider.h"
+#include "base/trace_event/sharded_allocation_register.h"
 #include "platform/wtf/Noncopyable.h"
-#include "platform/wtf/ThreadingPrimitives.h"
 #include "public/platform/WebCommon.h"
 
-namespace base {
-namespace trace_event {
-
-class AllocationRegister;
-
-}  // namespace trace_event
-}  // namespace base
-
 namespace blink {
 
 class BLINK_PLATFORM_EXPORT PartitionAllocMemoryDumpProvider final
     : public base::trace_event::MemoryDumpProvider {
   // TODO(tasak): PartitionAllocMemoryDumpProvider should be
   // USING_FAST_MALLOC. c.f. crbug.com/584196
   WTF_MAKE_NONCOPYABLE(PartitionAllocMemoryDumpProvider);
 
  public:
   static PartitionAllocMemoryDumpProvider* Instance();
   ~PartitionAllocMemoryDumpProvider() override;
 
   // MemoryDumpProvider implementation.
   bool OnMemoryDump(const base::trace_event::MemoryDumpArgs&,
                     base::trace_event::ProcessMemoryDump*) override;
   void OnHeapProfilingEnabled(bool) override;
 
   // These methods are called only from PartitionAllocHooks' callbacks.
   void insert(void*, size_t, const char*);
   void Remove(void*);
 
  private:
   PartitionAllocMemoryDumpProvider();
 
-  Mutex allocation_register_mutex_;
-  std::unique_ptr<base::trace_event::AllocationRegister> allocation_register_;
-  bool is_heap_profiling_enabled_;
+  base::trace_event::ShardedAllocationRegister allocation_register_;
 };
 
 }  // namespace blink
 
 #endif  // PartitionAllocMemoryDumpProvider_h