Add CreateTemporaryFile to PPB_Flash_File_ModuleLocal.

ppapi/thunk/ppb_flash_api.h

Index: ppapi/thunk/ppb_flash_api.h
diff --git a/ppapi/thunk/ppb_flash_api.h b/ppapi/thunk/ppb_flash_api.h
index fe7ec50a90c54087fafdcfdb28847bddcded42a5..6c576b8d56656cf87422ab5ff9d19cbe37cfc975 100644
--- a/ppapi/thunk/ppb_flash_api.h
+++ b/ppapi/thunk/ppb_flash_api.h
@@ -5,6 +5,8 @@
 #ifndef PPAPI_THUNK_PPB_FLASH_API_H_
 #define PPAPI_THUNK_PPB_FLASH_API_H_
 
+#include <string>
+
 #include "ppapi/c/private/ppb_flash.h"
 #include "ppapi/c/private/ppb_flash_clipboard.h"
 #include "ppapi/c/private/ppb_flash_file.h"
@@ -81,6 +83,10 @@ class PPAPI_THUNK_EXPORT PPB_Flash_API {
                                  PP_DirContents_Dev** contents) = 0;
   virtual void FreeDirContents(PP_Instance instance,
                                PP_DirContents_Dev* contents) = 0;
+  virtual int32_t CreateTemporaryFile(PP_Instance instance,
+                                      const char* dir_path,
+                                      PP_FileHandle* file,
+                                      std::string* file_name) = 0;
 
   // FlashFile_FileRef.
   virtual int32_t OpenFileRef(PP_Instance instance,