discardable_memory: Using mojo IPC to replace Chrome IPC

components/discardable_memory/service/discardable_shared_memory_manager_proxy.h

+// 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.
+
+#ifndef COMPONENTS_DISCARDABLE_MEMORY_SERVICE_DISCARDABLE_SHARED_MEMORY_MANAGER_PROXY_H_
+#define COMPONENTS_DISCARDABLE_MEMORY_SERVICE_DISCARDABLE_SHARED_MEMORY_MANAGER_PROXY_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "components/discardable_memory/common/discardable_memory_export.h"
+#include "components/discardable_memory/public/interfaces/discardable_shared_memory_manager.mojom.h"
+
+namespace discardable_memory {
+
+class DiscardableSharedMemoryManager;
+
+class DISCARDABLE_MEMORY_EXPORT DiscardableSharedMemoryManagerProxy
+    : public NON_EXPORTED_BASE(mojom::DiscardableSharedMemoryManager) {
+ public:
+  DiscardableSharedMemoryManagerProxy();
+  ~DiscardableSharedMemoryManagerProxy() override;
+
+  static void Create(mojom::DiscardableSharedMemoryManagerRequest request);

[reveman, 2016/11/15 16:13:20]

Can you replace this with a DiscardableSharedMemoryManager::Bind function and
keep this proxy an implementation detail of DiscardableSharedMemoryManager? ie.
move all of it to discardable_shared_memory_manager.cc

[Peng, 2016/11/15 19:04:05]

Done.

+
+  // mojom::DiscardableSharedMemoryManager overrides:
+  void AllocateLockedDiscardableSharedMemory(
+      uint32_t size,
+      int32_t id,
+      const AllocateLockedDiscardableSharedMemoryCallback& callback) override;
+  void DeletedDiscardableSharedMemory(int32_t id) override;
+
+ private:
+  static int last_client_id_;
+
+  const int32_t client_id_;
+  ::discardable_memory::DiscardableSharedMemoryManager* manager_;

[reveman, 2016/11/15 16:13:20]

nit: ..Manager* const manager_;

[Peng, 2016/11/15 19:04:05]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(DiscardableSharedMemoryManagerProxy);
+};
+
+}  // namespace discardable_memory
+
+#endif  // COMPONENTS_DISCARDABLE_MEMORY_SERVICE_DISCARDABLE_SHARED_MEMORY_MANAGER_PROXY_H_