content: Refactor ChildThreadImpl::Options

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 <string>
 
 #include "base/basictypes.h"
@@ skipping 43 matching lines @@
 class ResourceDispatcher;
 class ThreadSafeSender;
 class WebSocketDispatcher;
 struct RequestInfo;
 
 // The main thread of a child process derives from this class.
 class CONTENT_EXPORT ChildThreadImpl
     : public IPC::Listener,
       virtual public ChildThread {
  public:
-  struct CONTENT_EXPORT Options {
-    Options();
-    explicit Options(bool mojo);
-    Options(std::string name, bool mojo);
-    ~Options();
-
-    std::string channel_name;
-    bool use_mojo_channel;
-    bool in_browser_process;
-    std::vector<IPC::MessageFilter*> startup_filters;
-  };
+  struct CONTENT_EXPORT Options;
 
   // Creates the thread.
   ChildThreadImpl();
   // Allow to be used for single-process mode and for in process gpu mode via
   // options.
   explicit ChildThreadImpl(const Options& options);
   // 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
@@ skipping 213 matching lines @@
 
   scoped_refptr<NavigatorConnectDispatcher> navigator_connect_dispatcher_;
 
   bool in_browser_process_;
 
   base::WeakPtrFactory<ChildThreadImpl> channel_connected_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildThreadImpl);
 };
 
+struct ChildThreadImpl::Options {
+  ~Options();
+
+  class Builder;
+
+  std::string channel_name;
+  bool use_mojo_channel;
+  bool in_browser_process;
+  std::vector<IPC::MessageFilter*> startup_filters;
+
+ private:
+  Options();
+};
+
+class ChildThreadImpl::Options::Builder {
+ public:
+  Builder();
+
+  Builder& InBrowserProcess(bool in_browser_process);
+  Builder& UseMojoChannel(bool use_mojo_channel);
+  Builder& WithChannelName(const std::string& channel_name);
+  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_