Reland: Add MemoryCoordinator

components/memory_coordinator/public/interfaces/memory_coordinator.mojom

Index: components/memory_coordinator/public/interfaces/memory_coordinator.mojom
diff --git a/components/memory_coordinator/public/interfaces/memory_coordinator.mojom b/components/memory_coordinator/public/interfaces/memory_coordinator.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..f56250ac5f06f01e26b1aad87ae3998b61c9d8f3
--- /dev/null
+++ b/components/memory_coordinator/public/interfaces/memory_coordinator.mojom
@@ -0,0 +1,14 @@
+// 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.
+
+module memory_coordinator.mojom;
+
+import "components/memory_coordinator/public/interfaces/child_memory_coordinator.mojom";
+
+// An interface to access the central memory coordinator from a child process.
+// The browser process creates a handle for each child process.
+interface MemoryCoordinatorHandle {
+  // A child process calls this method when ChildMemoryCoordinator is created.
+  AddChild(ChildMemoryCoordinator child);
+};