[NotForReview] An idea for experimenting purge & suspend

content/browser/memory/memory_coordinator.cc

Index: content/browser/memory/memory_coordinator.cc
diff --git a/content/browser/memory/memory_coordinator.cc b/content/browser/memory/memory_coordinator.cc
index 52ee2ece71f8a47def79edd5401bd9c791680b49..098efddc4264d9f36c0f586622628293c3d066a1 100644
--- a/content/browser/memory/memory_coordinator.cc
+++ b/content/browser/memory/memory_coordinator.cc
@@ -34,11 +34,19 @@ class MemoryCoordinatorHandleImpl : public mojom::MemoryCoordinatorHandle {
 };
 
 // static
+bool MemoryCoordinator::IsEnabled() {
+  // TODO(tasak): Remove |kPurgeAndSuspend| when the experiment is done.
+  return base::FeatureList::IsEnabled(features::kMemoryCoordinator) ||
+         base::FeatureList::IsEnabled(features::kPurgeAndSuspend);
+}
+
+// static
 MemoryCoordinator* MemoryCoordinator::GetInstance() {
-  if (!base::FeatureList::IsEnabled(features::kMemoryCoordinator))
-    return nullptr;
-  return base::Singleton<MemoryCoordinator,
-                         base::LeakySingletonTraits<MemoryCoordinator>>::get();
+  if (IsEnabled()) {
+    return base::Singleton<MemoryCoordinator, base::LeakySingletonTraits<
+                                                  MemoryCoordinator>>::get();
+  }
+  return nullptr;
 }
 
 MemoryCoordinator::MemoryCoordinator() {}
@@ -89,6 +97,11 @@ mojom::MemoryState MemoryCoordinator::GetMemoryState(
   return iter->second.memory_state;
 }
 
+bool MemoryCoordinator::PurgeAndSuspendChild(int render_process_id) {
+  DCHECK(base::FeatureList::IsEnabled(features::kPurgeAndSuspend));
+  return SetMemoryState(render_process_id, mojom::MemoryState::SUSPENDED);
+}
+
 void MemoryCoordinator::AddChildForTesting(
     int dummy_render_process_id, mojom::ChildMemoryCoordinatorPtr child) {
   mojom::MemoryCoordinatorHandlePtr mch;