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

content/common/host_discardable_shared_memory_manager.cc

 // Copyright 2014 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 "content/common/host_discardable_shared_memory_manager.h"
 
 #include <algorithm>
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
@@ skipping 109 matching lines @@
                        kMaxDefaultMemoryLimit / 8
                        : kMaxDefaultMemoryLimit)),
       bytes_allocated_(0),
       memory_pressure_listener_(new base::MemoryPressureListener(
           base::Bind(&HostDiscardableSharedMemoryManager::OnMemoryPressure,
                      base::Unretained(this)))),
       enforce_memory_policy_pending_(false),
       weak_ptr_factory_(this) {
   DCHECK_NE(memory_limit_, 0u);
   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
-      this);
+      this, "HostDiscardableSharedMemoryManager");
 }
 
 HostDiscardableSharedMemoryManager::~HostDiscardableSharedMemoryManager() {
   base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
       this);
 }
 
 HostDiscardableSharedMemoryManager*
 HostDiscardableSharedMemoryManager::current() {
   return g_discardable_shared_memory_manager.Pointer();
@@ skipping 346 matching lines @@
 
   enforce_memory_policy_pending_ = true;
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&HostDiscardableSharedMemoryManager::EnforceMemoryPolicy,
                  weak_ptr_factory_.GetWeakPtr()),
       base::TimeDelta::FromMilliseconds(kEnforceMemoryPolicyDelayMs));
 }
 
 }  // namespace content