PPAPI/NaCl: Reinitialize some stuff when the ipc proxy starts.

ppapi/shared_impl/ppp_instance_combined.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 PPAPI_SHARED_IMPL_PPP_INSTANCE_COMBINED_H_
 #define PPAPI_SHARED_IMPL_PPP_INSTANCE_COMBINED_H_
 
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "ppapi/c/ppp_instance.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
 namespace ppapi {
 
 // This exposes the 1.1 interface and forwards it to the 1.0 interface is
 // necessary.
 struct PPAPI_SHARED_EXPORT PPP_Instance_Combined {
  public:
-  explicit PPP_Instance_Combined(const PPP_Instance_1_0& instance_if);
-  explicit PPP_Instance_Combined(const PPP_Instance_1_1& instance_if);
+  typedef const void*(GetInterfaceFunc)(const char*);
+  // Create a PPP_Instance_Combined. Uses the given |get_interface_func| to
+  // query the plugin and find the most recent version of the PPP_Instance
+  // interface.
+  static PPP_Instance_Combined* Create(
+      base::Callback<const void*(const char*)> get_plugin_if);
 
   PP_Bool DidCreate(PP_Instance instance,
                     uint32_t argc,
                     const char* argn[],
                     const char* argv[]);
   void DidDestroy(PP_Instance instance);
 
   // This version of DidChangeView encapsulates all arguments for both 1.0
   // and 1.1 versions of this function. Conversion from 1.1 -> 1.0 is easy,
   // but this class doesn't have the necessary context (resource interfaces)
   // to do the conversion, so the caller must do it.
   void DidChangeView(PP_Instance instance,
                      PP_Resource view_changed_resource,
                      const struct PP_Rect* position,
                      const struct PP_Rect* clip);
 
   void DidChangeFocus(PP_Instance instance, PP_Bool has_focus);
   PP_Bool HandleDocumentLoad(PP_Instance instance, PP_Resource url_loader);
 
  private:
+  explicit PPP_Instance_Combined(const PPP_Instance_1_0& instance_if);
+  explicit PPP_Instance_Combined(const PPP_Instance_1_1& instance_if);
+
   // For version 1.0, DidChangeView will be NULL, and DidChangeView_1_0 will
   // be set below.
   PPP_Instance_1_1 instance_1_1_;
 
   // Non-NULL when Instance 1.0 is used.
   void (*did_change_view_1_0_)(PP_Instance instance,
                                const struct PP_Rect* position,
                                const struct PP_Rect* clip);
 
   DISALLOW_COPY_AND_ASSIGN(PPP_Instance_Combined);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPP_INSTANCE_COMBINED_H_