discardable_memory: Using mojo IPC to replace Chrome IPC

content/child/child_thread_impl.h

 // Copyright (c) 2012 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 CONTENT_CHILD_CHILD_THREAD_IMPL_H_
 #define CONTENT_CHILD_CHILD_THREAD_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/shared_memory.h"
 #include "base/memory/weak_ptr.h"
 #include "base/power_monitor/power_monitor.h"
-#include "base/sequenced_task_runner.h"
+#include "base/single_thread_task_runner.h"
 #include "base/tracked_objects.h"
 #include "build/build_config.h"
 #include "content/common/associated_interfaces.mojom.h"
 #include "content/common/content_export.h"
 #include "content/public/child/child_thread.h"
 #include "ipc/ipc.mojom.h"
 #include "ipc/ipc_message.h"  // For IPC_MESSAGE_LOG_ENABLED.
 #include "ipc/ipc_platform_file.h"
 #include "ipc/message_router.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
@@ skipping 189 matching lines @@
   virtual void OnProcessBackgrounded(bool backgrounded);
   virtual void OnProcessPurgeAndSuspend();
   virtual void OnProcessResume();
 
   // IPC::Listener implementation:
   bool OnMessageReceived(const IPC::Message& msg) override;
   void OnChannelConnected(int32_t peer_pid) override;
   void OnChannelError() override;
 
   bool IsInBrowserProcess() const;
-  scoped_refptr<base::SequencedTaskRunner> GetIOTaskRunner();
+  scoped_refptr<base::SingleThreadTaskRunner> GetIOTaskRunner();
 
  private:
   class ChildThreadMessageRouter : public IPC::MessageRouter {
    public:
     // |sender| must outlive this object.
     explicit ChildThreadMessageRouter(IPC::Sender* sender);
     bool Send(IPC::Message* msg) override;
 
     // MessageRouter overrides.
     bool RouteMessage(const IPC::Message& msg) override;
 
    private:
     IPC::Sender* const sender_;
   };
 
-  class ClientDiscardableSharedMemoryManagerDelegate;
-
   void Init(const Options& options);
 
   // We create the channel first without connecting it so we can add filters
   // prior to any messages being received, then connect it afterwards.
   void ConnectChannel();
 
   // IPC message handlers.
   void OnShutdown();
   void OnSetProfilerStatus(tracked_objects::ThreadData::Status status);
   void OnGetChildProfilerData(int sequence_number, int current_profiling_phase);
@@ skipping 70 matching lines @@
 
   scoped_refptr<NotificationDispatcher> notification_dispatcher_;
 
   scoped_refptr<PushDispatcher> push_dispatcher_;
 
   std::unique_ptr<ChildSharedBitmapManager> shared_bitmap_manager_;
 
   std::unique_ptr<discardable_memory::ClientDiscardableSharedMemoryManager>
       discardable_shared_memory_manager_;
 
-  std::unique_ptr<ClientDiscardableSharedMemoryManagerDelegate>
-      client_discardable_shared_memory_manager_delegate_;
-
   std::unique_ptr<base::PowerMonitor> power_monitor_;
 
-  scoped_refptr<base::SequencedTaskRunner> browser_process_io_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> browser_process_io_runner_;
 
   std::unique_ptr<base::WeakPtrFactory<ChildThreadImpl>>
       channel_connected_factory_;
 
   base::WeakPtrFactory<ChildThreadImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildThreadImpl);
 };
 
 struct ChildThreadImpl::Options {
   Options(const Options& other);
   ~Options();
 
   class Builder;
 
   bool auto_start_service_manager_connection;
   bool connect_to_browser;
-  scoped_refptr<base::SequencedTaskRunner> browser_process_io_runner;
+  bool init_discardable_memory;
+  scoped_refptr<base::SingleThreadTaskRunner> browser_process_io_runner;
   std::vector<IPC::MessageFilter*> startup_filters;
   std::string in_process_service_request_token;
 
  private:
   Options();
 };
 
 class ChildThreadImpl::Options::Builder {
  public:
   Builder();
 
   Builder& InBrowserProcess(const InProcessChildThreadParams& params);
   Builder& AutoStartServiceManagerConnection(bool auto_start);
+  Builder& InitDiscardableMemory(bool discardable_memory);
   Builder& ConnectToBrowser(bool connect_to_browser);
   Builder& AddStartupFilter(IPC::MessageFilter* filter);
 
   Options Build();
 
  private:
   struct Options options_;
 
   DISALLOW_COPY_AND_ASSIGN(Builder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_CHILD_THREAD_IMPL_H_