[NotForReview] An idea for experimenting purge & suspend

content/child/memory/child_memory_coordinator_impl.cc

 // Copyright 2016 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/child/memory/child_memory_coordinator_impl.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/memory_coordinator_client_registry.h"
 #include "base/synchronization/lock.h"
+#include "content/public/common/content_features.h"
 
 namespace content {
 
 namespace {
 
 base::LazyInstance<base::Lock>::Leaky g_lock = LAZY_INSTANCE_INITIALIZER;
 ChildMemoryCoordinatorImpl* g_child_memory_coordinator = nullptr;
 
 base::MemoryState ToBaseMemoryState(mojom::MemoryState state) {
   switch (state) {
     case mojom::MemoryState::UNKNOWN:
       return base::MemoryState::UNKNOWN;
     case mojom::MemoryState::NORMAL:
       return base::MemoryState::NORMAL;
     case mojom::MemoryState::THROTTLED:
       return base::MemoryState::THROTTLED;
     case mojom::MemoryState::SUSPENDED:
       return base::MemoryState::SUSPENDED;
     default:
       NOTREACHED();
       return base::MemoryState::UNKNOWN;
   }
 }
 
 }  // namespace
 
 // static
+bool ChildMemoryCoordinatorImpl::IsEnabled() {
+  // TODO(tasak): Remove |kPurgeAndSuspend| when the experiment is done.
+  return base::FeatureList::IsEnabled(features::kMemoryCoordinator) ||
+         base::FeatureList::IsEnabled(features::kPurgeAndSuspend);
+}
+
+// static
 ChildMemoryCoordinatorImpl* ChildMemoryCoordinatorImpl::GetInstance() {
   base::AutoLock lock(*g_lock.Pointer());
   return g_child_memory_coordinator;
 }
 
 ChildMemoryCoordinatorImpl::ChildMemoryCoordinatorImpl(
     mojom::MemoryCoordinatorHandlePtr parent,
     ChildMemoryCoordinatorDelegate* delegate)
     : binding_(this), parent_(std::move(parent)), delegate_(delegate) {
   base::AutoLock lock(*g_lock.Pointer());
@@ skipping 18 matching lines @@
 #if !defined(OS_ANDROID)
 std::unique_ptr<ChildMemoryCoordinatorImpl> CreateChildMemoryCoordinator(
     mojom::MemoryCoordinatorHandlePtr parent,
     ChildMemoryCoordinatorDelegate* delegate) {
   return base::WrapUnique(
       new ChildMemoryCoordinatorImpl(std::move(parent), delegate));
 }
 #endif
 
 }  // namespace content