[tracing] Add names to memory-infra dumpers for debugging

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 "base/strings/stringprintf.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "gin/public/isolate_holder.h"
 #include "v8/include/v8.h"
 
 namespace gin {
 
 V8IsolateMemoryDumpProvider::V8IsolateMemoryDumpProvider(
     IsolateHolder* isolate_holder)
     : isolate_holder_(isolate_holder) {
   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
-      this, base::ThreadTaskRunnerHandle::Get());
+      this, "V8Isolate", base::ThreadTaskRunnerHandle::Get());
 }
 
 V8IsolateMemoryDumpProvider::~V8IsolateMemoryDumpProvider() {
   base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
       this);
 }
 
 // Called at trace dump point time. Creates a snapshot with the memory counters
 // for the current isolate.
 bool V8IsolateMemoryDumpProvider::OnMemoryDump(
@@ skipping 116 matching lines @@
   }
 
   if (did_dump_object_stats) {
     process_memory_dump->AddOwnershipEdge(
         process_memory_dump->CreateAllocatorDump(object_name_prefix)->guid(),
         process_memory_dump->CreateAllocatorDump(space_name_prefix)->guid());
   }
 }
 
 }  // namespace gin