Move a bunch of child-only code from content/common to content/child

content/common/child_thread.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_COMMON_CHILD_THREAD_H_
-#define CONTENT_COMMON_CHILD_THREAD_H_
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "base/shared_memory.h"
-#include "base/tracked_objects.h"
-#include "content/common/content_export.h"
-#include "content/common/message_router.h"
-#include "ipc/ipc_message.h"  // For IPC_MESSAGE_LOG_ENABLED.
-#include "webkit/glue/resource_loader_bridge.h"
-
-namespace base {
-class MessageLoop;
-}
-
-namespace IPC {
-class SyncChannel;
-class SyncMessageFilter;
-}
-
-namespace WebKit {
-class WebFrame;
-}
-
-namespace content {
-class ChildHistogramMessageFilter;
-class ChildResourceMessageFilter;
-class FileSystemDispatcher;
-class QuotaDispatcher;
-class ResourceDispatcher;
-class SocketStreamDispatcher;
-class ThreadSafeSender;
-
-// The main thread of a child process derives from this class.
-class CONTENT_EXPORT ChildThread : public IPC::Listener, public IPC::Sender {
- public:
-  // Creates the thread.
-  ChildThread();
-  // Used for single-process mode.
-  explicit ChildThread(const std::string& channel_name);
-  // ChildProcess::main_thread() is reset after Shutdown(), and before the
-  // destructor, so any subsystem that relies on ChildProcess::main_thread()
-  // must be terminated before Shutdown returns. In particular, if a subsystem
-  // has a thread that post tasks to ChildProcess::main_thread(), that thread
-  // should be joined in Shutdown().
-  virtual ~ChildThread();
-  virtual void Shutdown() = 0;
-
-  // IPC::Sender implementation:
-  virtual bool Send(IPC::Message* msg) OVERRIDE;
-
-  // See documentation on MessageRouter for AddRoute and RemoveRoute
-  void AddRoute(int32 routing_id, IPC::Listener* listener);
-  void RemoveRoute(int32 routing_id);
-
-  IPC::SyncChannel* channel() { return channel_.get(); }
-
-  // Creates a ResourceLoaderBridge.
-  // Tests can override this method if they want a custom loading behavior.
-  virtual webkit_glue::ResourceLoaderBridge* CreateBridge(
-      const webkit_glue::ResourceLoaderBridge::RequestInfo& request_info);
-
-  // Allocates a block of shared memory of the given size and
-  // maps in into the address space. Returns NULL of failure.
-  // Note: On posix, this requires a sync IPC to the browser process,
-  // but on windows the child process directly allocates the block.
-  base::SharedMemory* AllocateSharedMemory(size_t buf_size);
-
-  // A static variant that can be called on background threads provided
-  // the |sender| passed in is safe to use on background threads.
-  static base::SharedMemory* AllocateSharedMemory(size_t buf_size,
-                                                  IPC::Sender* sender);
-
-  ResourceDispatcher* resource_dispatcher() const {
-    return resource_dispatcher_.get();
-  }
-
-  SocketStreamDispatcher* socket_stream_dispatcher() const {
-    return socket_stream_dispatcher_.get();
-  }
-
-  FileSystemDispatcher* file_system_dispatcher() const {
-    return file_system_dispatcher_.get();
-  }
-
-  QuotaDispatcher* quota_dispatcher() const {
-    return quota_dispatcher_.get();
-  }
-
-  // Safe to call on any thread, as long as it's guaranteed that the thread's
-  // lifetime is less than the main thread. The |filter| returned may only
-  // be used on background threads.
-  IPC::SyncMessageFilter* sync_message_filter() const {
-    return sync_message_filter_.get();
-  }
-
-  // The getter should only be called on the main thread, however the
-  // IPC::Sender it returns may be safely called on any thread including
-  // the main thread.
-  ThreadSafeSender* thread_safe_sender() const {
-    return thread_safe_sender_.get();
-  }
-
-  ChildHistogramMessageFilter* child_histogram_message_filter() const {
-    return histogram_message_filter_.get();
-  }
-
-  base::MessageLoop* message_loop() const { return message_loop_; }
-
-  // Returns the one child thread.
-  static ChildThread* current();
-
-  virtual bool IsWebFrameValid(WebKit::WebFrame* frame);
-
- protected:
-  friend class ChildProcess;
-
-  // Called when the process refcount is 0.
-  void OnProcessFinalRelease();
-
-  virtual bool OnControlMessageReceived(const IPC::Message& msg);
-
-  void set_on_channel_error_called(bool on_channel_error_called) {
-    on_channel_error_called_ = on_channel_error_called;
-  }
-
-  // IPC::Listener implementation:
-  virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
-  virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
-  virtual void OnChannelError() OVERRIDE;
-
- private:
-  void Init();
-
-  // IPC message handlers.
-  void OnShutdown();
-  void OnSetProfilerStatus(tracked_objects::ThreadData::Status status);
-  void OnGetChildProfilerData(int sequence_number);
-  void OnDumpHandles();
-#ifdef IPC_MESSAGE_LOG_ENABLED
-  void OnSetIPCLoggingEnabled(bool enable);
-#endif
-#if defined(USE_TCMALLOC)
-  void OnGetTcmallocStats();
-#endif
-
-  void EnsureConnected();
-
-  std::string channel_name_;
-  scoped_ptr<IPC::SyncChannel> channel_;
-
-  // Allows threads other than the main thread to send sync messages.
-  scoped_refptr<IPC::SyncMessageFilter> sync_message_filter_;
-
-  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
-
-  // Implements message routing functionality to the consumers of ChildThread.
-  MessageRouter router_;
-
-  // Handles resource loads for this process.
-  scoped_ptr<ResourceDispatcher> resource_dispatcher_;
-
-  // Handles SocketStream for this process.
-  scoped_ptr<SocketStreamDispatcher> socket_stream_dispatcher_;
-
-  // The OnChannelError() callback was invoked - the channel is dead, don't
-  // attempt to communicate.
-  bool on_channel_error_called_;
-
-  base::MessageLoop* message_loop_;
-
-  scoped_ptr<FileSystemDispatcher> file_system_dispatcher_;
-
-  scoped_ptr<QuotaDispatcher> quota_dispatcher_;
-
-  scoped_refptr<ChildHistogramMessageFilter> histogram_message_filter_;
-
-  scoped_refptr<ChildResourceMessageFilter> resource_message_filter_;
-
-  base::WeakPtrFactory<ChildThread> channel_connected_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(ChildThread);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_CHILD_THREAD_H_