Allow child thread to install filters prior to channel connection.

content/child/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_CHILD_CHILD_THREAD_H_
 #define CONTENT_CHILD_CHILD_THREAD_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
 #include "base/memory/weak_ptr.h"
 #include "base/power_monitor/power_monitor.h"
 #include "base/tracked_objects.h"
 #include "content/child/mojo/mojo_application.h"
 #include "content/common/content_export.h"
 #include "content/common/message_router.h"
 #include "ipc/ipc_message.h"  // For IPC_MESSAGE_LOG_ENABLED.
 
 namespace base {
 class MessageLoop;
 
 namespace debug {
 class TraceMemoryController;
 }  // namespace debug
 }  // namespace base
 
 namespace IPC {
+class MessageFilter;
 class SyncChannel;
 class SyncMessageFilter;
 }  // namespace IPC
 
 namespace blink {
 class WebFrame;
 }  // namespace blink
 
 namespace content {
 class BluetoothMessageFilter;
@@ skipping 14 matching lines @@
 class ThreadSafeSender;
 class WebSocketDispatcher;
 struct RequestInfo;
 
 // The main thread of a child process derives from this class.
 class CONTENT_EXPORT ChildThread : public IPC::Listener, public IPC::Sender {
  public:
   struct CONTENT_EXPORT Options {
     Options();
     explicit Options(bool mojo);
-    Options(std::string name, bool mojo)
-        : channel_name(name), use_mojo_channel(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;
   };
 
   // Creates the thread.
   ChildThread();
-  // Used for single-process mode and for in process gpu mode.
+  // Allow to be used for single-process mode and for in process gpu mode via
+  // options.
   explicit ChildThread(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
   // should be joined in Shutdown().
   ~ChildThread() override;
   virtual void Shutdown();
 
   // IPC::Sender implementation:
@@ skipping 116 matching lines @@
    public:
     // |sender| must outlive this object.
     explicit ChildThreadMessageRouter(IPC::Sender* sender);
     bool Send(IPC::Message* msg) override;
 
    private:
     IPC::Sender* const sender_;
   };
 
   void Init(const Options& options);
-  scoped_ptr<IPC::SyncChannel> CreateChannel(bool use_mojo_channel);
+
+  // 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(bool use_mojo_channel);
 
   // IPC message handlers.
   void OnShutdown();
   void OnSetProfilerStatus(tracked_objects::ThreadData::Status status);
   void OnGetChildProfilerData(int sequence_number);
   void OnDumpHandles();
   void OnProcessBackgrounded(bool background);
 #ifdef IPC_MESSAGE_LOG_ENABLED
   void OnSetIPCLoggingEnabled(bool enable);
 #endif
@@ skipping 65 matching lines @@
   bool in_browser_process_;
 
   base::WeakPtrFactory<ChildThread> channel_connected_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_CHILD_THREAD_H_