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

ppapi/shared_impl/ppp_instance_combined.h

Index: ppapi/shared_impl/ppp_instance_combined.h
diff --git a/ppapi/shared_impl/ppp_instance_combined.h b/ppapi/shared_impl/ppp_instance_combined.h
index 7bb229fbbf1f2b571c52025022df714c6352b934..05eada07eb231188513de1f7a2bc26f1cc6a55f9 100644
--- a/ppapi/shared_impl/ppp_instance_combined.h
+++ b/ppapi/shared_impl/ppp_instance_combined.h
@@ -6,6 +6,7 @@
 #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"
 
@@ -15,8 +16,12 @@ namespace ppapi {
 // 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,
@@ -37,6 +42,9 @@ struct PPAPI_SHARED_EXPORT PPP_Instance_Combined {
   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_;