Update from https://crrev.com/309415

base/memory/discardable_memory_shmem.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 "base/memory/discardable_memory_shmem.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/discardable_memory_shmem_allocator.h"
 #include "base/memory/discardable_shared_memory.h"
 
@@ skipping 75 matching lines @@
   is_locked_ = false;
 }
 
 void* DiscardableMemoryShmem::Memory() const {
   DCHECK(is_locked_);
   DCHECK(shared_memory_);
   return shared_memory_->memory();
 }
 
 bool DiscardableMemoryShmem::AllocateAndAcquireLock() {
-  if (shared_memory_ && shared_memory_->Lock())
+  if (shared_memory_ && shared_memory_->Lock(0, 0))
     return true;
 
   // TODO(reveman): Allocate fixed size memory segments and use a free list to
   // improve performance and limit the number of file descriptors used.
   shared_memory_ = DiscardableMemoryShmemAllocator::GetInstance()
                        ->AllocateLockedDiscardableSharedMemory(bytes_);
   DCHECK(shared_memory_);
   return false;
 }
 
 void DiscardableMemoryShmem::ReleaseLock() {
-  shared_memory_->Unlock();
+  shared_memory_->Unlock(0, 0);
 }
 
 void DiscardableMemoryShmem::Purge() {
   shared_memory_->Purge(Time());
   shared_memory_.reset();
 }
 
 bool DiscardableMemoryShmem::IsMemoryResident() const {
   return shared_memory_->IsMemoryResident();
 }
 
 }  // namespace internal
 }  // namespace base