Do V8 GC ASAP if system memory is pressured

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 <utility>
 
 #include "base/atomic_sequence_num.h"
@@ skipping 147 matching lines @@
 HostDiscardableSharedMemoryManager::MemorySegment::MemorySegment(
     std::unique_ptr<base::DiscardableSharedMemory> memory)
     : memory_(std::move(memory)) {}
 
 HostDiscardableSharedMemoryManager::MemorySegment::~MemorySegment() {
 }
 
 HostDiscardableSharedMemoryManager::HostDiscardableSharedMemoryManager()
     : memory_limit_(GetDefaultMemoryLimit()),
       bytes_allocated_(0),
-      memory_pressure_listener_(new base::MemoryPressureListener(
+      memory_pressure_listener_(base::MemoryPressureListener::Create(
           base::Bind(&HostDiscardableSharedMemoryManager::OnMemoryPressure,
                      base::Unretained(this)))),
       // Current thread might not have a task runner in tests.
       enforce_memory_policy_task_runner_(base::ThreadTaskRunnerHandle::Get()),
       enforce_memory_policy_pending_(false),
       weak_ptr_factory_(this) {
   DCHECK_NE(memory_limit_, 0u);
   enforce_memory_policy_callback_ =
       base::Bind(&HostDiscardableSharedMemoryManager::EnforceMemoryPolicy,
                  weak_ptr_factory_.GetWeakPtr());
@@ skipping 361 matching lines @@
     return;
 
   enforce_memory_policy_pending_ = true;
   DCHECK(enforce_memory_policy_task_runner_);
   enforce_memory_policy_task_runner_->PostDelayedTask(
       FROM_HERE, enforce_memory_policy_callback_,
       base::TimeDelta::FromMilliseconds(kEnforceMemoryPolicyDelayMs));
 }
 
 }  // namespace content