Make shared memory allocation possible for all child process types.

content/common/child_thread.h

 // Copyright (c) 2011 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_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/shared_memory.h"
 #include "content/common/content_export.h"
 #include "content/common/message_router.h"
 #include "webkit/glue/resource_loader_bridge.h"
 
 class FileSystemDispatcher;
 class MessageLoop;
 class NotificationService;
 class QuotaDispatcher;
 class ResourceDispatcher;
 class SocketStreamDispatcher;
@@ skipping 22 matching lines @@
 
   IPC::Channel::Listener* ResolveRoute(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);
+
   ResourceDispatcher* resource_dispatcher();
 
   SocketStreamDispatcher* socket_stream_dispatcher() {
     return socket_stream_dispatcher_.get();
   }
 
   FileSystemDispatcher* file_system_dispatcher() const {
     return file_system_dispatcher_.get();
   }
 
@@ skipping 66 matching lines @@
   scoped_ptr<NotificationService> notification_service_;
 
   scoped_ptr<FileSystemDispatcher> file_system_dispatcher_;
 
   scoped_ptr<QuotaDispatcher> quota_dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildThread);
 };
 
 #endif  // CONTENT_COMMON_CHILD_THREAD_H_