Also report peak malloc memory usage from V8

gin/v8_isolate_memory_dump_provider.cc

 // 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 "gin/v8_isolate_memory_dump_provider.h"
 
 #include <inttypes.h>
 #include <stddef.h>
 
 #include "base/strings/stringprintf.h"
@@ skipping 146 matching lines @@
                         heap_statistics.total_heap_size() -
                             heap_statistics.total_physical_size());
   }
 
   // Dump statistics about malloced memory.
   std::string malloc_name = dump_base_name + "/malloc";
   auto* malloc_dump = process_memory_dump->CreateAllocatorDump(malloc_name);
   malloc_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
                          base::trace_event::MemoryAllocatorDump::kUnitsBytes,
                          heap_statistics.malloced_memory());
+  malloc_dump->AddScalar("peak_size",
+                         base::trace_event::MemoryAllocatorDump::kUnitsBytes,
+                         heap_statistics.peak_malloced_memory());
   const char* system_allocator_name =
       base::trace_event::MemoryDumpManager::GetInstance()
           ->system_allocator_pool_name();
   if (system_allocator_name) {
     process_memory_dump->AddSuballocation(malloc_dump->guid(),
                                           system_allocator_name);
   }
 
   // Add an empty row for the heap_spaces. This is to keep the shape of the
   // dump stable, whether code stats are enabled or not.
@@ skipping 49 matching lines @@
     process_memory_dump->AddOwnershipEdge(
         process_memory_dump->CreateAllocatorDump(object_name_prefix)->guid(),
         heap_spaces_dump->guid());
   }
 
   // Dump statistics related to code and bytecode if requested.
   DumpCodeStatistics(heap_spaces_dump, isolate_holder_);
 }
 
 }  // namespace gin