Reland: Add MemoryCoordinator

components/memory_coordinator/child/child_memory_coordinator_impl.cc

Index: components/memory_coordinator/child/child_memory_coordinator_impl.cc
diff --git a/components/memory_coordinator/child/child_memory_coordinator_impl.cc b/components/memory_coordinator/child/child_memory_coordinator_impl.cc
index 75889ed43f66e6463c0e9b3dc0ed578ca745b85b..d1f9f6c0009b4f79898e33e87711aedb5694c613 100644
--- a/components/memory_coordinator/child/child_memory_coordinator_impl.cc
+++ b/components/memory_coordinator/child/child_memory_coordinator_impl.cc
@@ -7,12 +7,26 @@
 namespace memory_coordinator {
 
 ChildMemoryCoordinatorImpl::ChildMemoryCoordinatorImpl(
-      mojo::InterfaceRequest<mojom::ChildMemoryCoordinator> request,
-      scoped_refptr<ClientList> clients)
-    : binding_(this, std::move(request)),
-      clients_(clients) {}
+    shell::InterfaceProvider* remote_interfaces)
+    : binding_(this), clients_(new ClientList) {
+  if (remote_interfaces) {
+    remote_interfaces->GetInterface(mojo::GetProxy(&parent_));
+    parent_->AddChild(binding_.CreateInterfacePtrAndBind());
+  }
+}
+
+ChildMemoryCoordinatorImpl::~ChildMemoryCoordinatorImpl() {
+}
 
-ChildMemoryCoordinatorImpl::~ChildMemoryCoordinatorImpl() {}
+void ChildMemoryCoordinatorImpl::RegisterClient(
+    MemoryCoordinatorClient* client) {
+  clients_->AddObserver(client);
+}
+
+void ChildMemoryCoordinatorImpl::UnregisterClient(
+    MemoryCoordinatorClient* client) {
+  clients_->RemoveObserver(client);
+}
 
 void ChildMemoryCoordinatorImpl::OnStateChange(mojom::MemoryState state) {
   clients_->Notify(FROM_HERE, &MemoryCoordinatorClient::OnMemoryStateChange,