PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation

content/browser/renderer_host/pepper/pepper_file_ref_host.h

Index: content/browser/renderer_host/pepper/pepper_file_ref_host.h
diff --git a/content/browser/renderer_host/pepper/pepper_file_ref_host.h b/content/browser/renderer_host/pepper/pepper_file_ref_host.h
index 10d9a3ee76eb44fb601292946ae4fdc9af1ae6e0..5a33806a88c582f2129905f8957e027c21bcdaaf 100644
--- a/content/browser/renderer_host/pepper/pepper_file_ref_host.h
+++ b/content/browser/renderer_host/pepper/pepper_file_ref_host.h
@@ -29,6 +29,7 @@ class PepperFileRefBackend {
   virtual ~PepperFileRefBackend();
 
   virtual int32_t MakeDirectory(ppapi::host::ReplyMessageContext context,
+                                bool exclusive,
                                 bool make_ancestors) = 0;
   virtual int32_t Touch(ppapi::host::ReplyMessageContext context,
                         PP_Time last_accessed_time,
@@ -89,6 +90,7 @@ class CONTENT_EXPORT PepperFileRefHost
 
  private:
   int32_t OnMakeDirectory(ppapi::host::HostMessageContext* context,
+                          bool exclusive,
                           bool make_ancestors);
   int32_t OnTouch(ppapi::host::HostMessageContext* context,
                   PP_Time last_access_time,