discardable_memory: Using mojo IPC to replace Chrome IPC

components/discardable_memory/public/interfaces/discardable_shared_memory_manager.mojom

Index: components/discardable_memory/public/interfaces/discardable_shared_memory_manager.mojom
diff --git a/components/discardable_memory/public/interfaces/discardable_shared_memory_manager.mojom b/components/discardable_memory/public/interfaces/discardable_shared_memory_manager.mojom
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+// 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 discardable_memory.mojom;
+
+interface DiscardableSharedMemoryManager {
+  // Allocate a locked discardable shared memory segment.
+  AllocateLockedDiscardableSharedMemory(
+      uint32 size,
+      int32 id) => (handle<shared_buffer> memory);
+  // Notify manager that a memory segment has been deleted.
+  DeletedDiscardableSharedMemory(int32 id);
+};