Add ability to create pending resource hosts.

ppapi/host/resource_host.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 PPAPI_HOST_RESOURCE_HOST_H_
 #define PPAPI_HOST_RESOURCE_HOST_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 25 matching lines @@
   PpapiHost* host() { return host_; }
   PP_Instance pp_instance() const { return pp_instance_; }
   PP_Resource pp_resource() const { return pp_resource_; }
 
   // This runs any message filters in |message_filters_|. If the message is not
   // handled by these filters then the host's own message handler is run. True
   // is always returned (the message will always be handled in some way).
   virtual bool HandleMessage(const IPC::Message& msg,
                              HostMessageContext* context) OVERRIDE;
 
+  // Sets the PP_Resource ID when the plugin attaches to a pending resource
+  // host. This will notify subclasses by calling
+  // DidConnectPendingHostToResource.
+  //
+  // The current PP_Resource for all pending hosts should be 0.  See
+  // PpapiHostMsg_AttachToPendingHost.
+  void SetPPResourceForPendingHost(PP_Resource pp_resource);
+
   virtual void SendReply(const ReplyMessageContext& context,
                          const IPC::Message& msg) OVERRIDE;
 
   virtual bool IsGraphics2DHost() const { return false; }
 
  protected:
   // Adds a ResourceMessageFilter to handle resource messages. Incoming
   // messages will be passed to the handlers of these filters before being
   // handled by the resource host's own message handler. This allows
   // ResourceHosts to easily handle messages on other threads.
   void AddFilter(scoped_refptr<ResourceMessageFilter> filter);
 
+  // Called when this resource host is pending and the corresponding plugin has
+  // just connected to it. The host resource subclass can implement this
+  // function if it wants to do processing (typically sending queued data).
+  //
+  // The PP_Resource will be valid for this call but not before.
+  virtual void DidConnectPendingHostToResource() {}
+
  private:
   // The host that owns this object.
   PpapiHost* host_;
 
   PP_Instance pp_instance_;
   PP_Resource pp_resource_;
 
   // A vector of message filters which the host will forward incoming resource
   // messages to.
   std::vector<scoped_refptr<ResourceMessageFilter> > message_filters_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceHost);
 };
 
 }  // namespace host
 }  // namespace ppapi
 
 #endif  // PPAPI_HOST_RESOURCE_HOST_H_