Implement the file chooser as a new resource "host"

ppapi/shared_impl/resource.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_SHARED_IMPL_RESOURCE_H_
 #define PPAPI_SHARED_IMPL_RESOURCE_H_
 
 #include <stddef.h>  // For NULL.
 
 #include <string>
@@ skipping 47 matching lines @@
   F(PPB_URLRequestInfo_API) \
   F(PPB_URLResponseInfo_API) \
   F(PPB_VideoCapture_API) \
   F(PPB_VideoDecoder_API) \
   F(PPB_VideoLayer_API) \
   F(PPB_View_API) \
   F(PPB_WebSocket_API) \
   F(PPB_Widget_API) \
   F(PPB_X509Certificate_Private_API)
 
+namespace IPC {
+class Message;
+}
+
 namespace ppapi {
 
 // Forward declare all the resource APIs.
 namespace thunk {
 #define DECLARE_RESOURCE_CLASS(RESOURCE) class RESOURCE;
 FOR_ALL_PPAPI_RESOURCE_APIS(DECLARE_RESOURCE_CLASS)
 #undef DECLARE_RESOURCE_CLASS
 }  // namespace thunk
 
 // Resources have slightly different registration behaviors when the're an
@@ skipping 76 matching lines @@
   // it's supported. Derived classes override the functions they support to
   // return the interface.
   #define DEFINE_TYPE_GETTER(RESOURCE) \
     virtual thunk::RESOURCE* As##RESOURCE();
   FOR_ALL_PPAPI_RESOURCE_APIS(DEFINE_TYPE_GETTER)
   #undef DEFINE_TYPE_GETTER
 
   // Template-based dynamic casting. See specializations below.
   template <typename T> T* GetAs() { return NULL; }
 
+  // Called when a PpapiPluginMsg_ResourceReply reply is received for a
+  // previous CallRenderer. The sequence number is the value returned the
+  // send function for the given request. The message is the nested reply
+  // message, which may be an empty message (depending on what the host
+  // sends).
+  //
+  // The default implementation will assert (if you send a request, you should
+  // override this function.
+  //
+  // (This function would make more conceptual sense on PluginResource but we
+  // need to call this function from general code that doesn't know how ti
+  // distinguish the classes.)
+  virtual void OnReplyReceived(int sequence,
+                               int32_t result,
+                               const IPC::Message& msg);
+
  protected:
   // Logs a message to the console from this resource.
   void Log(PP_LogLevel_Dev level, const std::string& message);
 
  private:
   // See the getters above.
   PP_Resource pp_resource_;
   HostResource host_resource_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Resource);
 };
 
 // Template-based dynamic casting. These specializations forward to the
 // AsXXX virtual functions to return whether the given type is supported.
 #define DEFINE_RESOURCE_CAST(RESOURCE) \
   template<> inline thunk::RESOURCE* Resource::GetAs() { \
     return As##RESOURCE(); \
   }
 FOR_ALL_PPAPI_RESOURCE_APIS(DEFINE_RESOURCE_CAST)
 #undef DEFINE_RESOURCE_CAST
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_RESOURCE_H_