PPAPI: Force async callback invocation option.

ppapi/cpp/file_io.cc

Index: ppapi/cpp/file_io.cc
===================================================================
--- ppapi/cpp/file_io.cc	(revision 91178)
+++ ppapi/cpp/file_io.cc	(working copy)
@@ -41,7 +41,7 @@
                      int32_t open_flags,
                      const CompletionCallback& cc) {
   if (!has_interface<PPB_FileIO>())
-    return PP_ERROR_NOINTERFACE;
+    return cc.MayForce(PP_ERROR_NOINTERFACE);
   return get_interface<PPB_FileIO>()->Open(
       pp_resource(), file_ref.pp_resource(), open_flags,
       cc.pp_completion_callback());
@@ -50,7 +50,7 @@
 int32_t FileIO::Query(PP_FileInfo* result_buf,
                       const CompletionCallback& cc) {
   if (!has_interface<PPB_FileIO>())
-    return PP_ERROR_NOINTERFACE;
+    return cc.MayForce(PP_ERROR_NOINTERFACE);
   return get_interface<PPB_FileIO>()->Query(
       pp_resource(), result_buf, cc.pp_completion_callback());
 }
@@ -59,7 +59,7 @@
                       PP_Time last_modified_time,
                       const CompletionCallback& cc) {
   if (!has_interface<PPB_FileIO>())
-    return PP_ERROR_NOINTERFACE;
+    return cc.MayForce(PP_ERROR_NOINTERFACE);
   return get_interface<PPB_FileIO>()->Touch(
       pp_resource(), last_access_time, last_modified_time,
       cc.pp_completion_callback());
@@ -70,7 +70,7 @@
                      int32_t bytes_to_read,
                      const CompletionCallback& cc) {
   if (!has_interface<PPB_FileIO>())
-    return PP_ERROR_NOINTERFACE;
+    return cc.MayForce(PP_ERROR_NOINTERFACE);
   return get_interface<PPB_FileIO>()->Read(pp_resource(),
       offset, buffer, bytes_to_read, cc.pp_completion_callback());
 }
@@ -80,7 +80,7 @@
                       int32_t bytes_to_write,
                       const CompletionCallback& cc) {
   if (!has_interface<PPB_FileIO>())
-    return PP_ERROR_NOINTERFACE;
+    return cc.MayForce(PP_ERROR_NOINTERFACE);
   return get_interface<PPB_FileIO>()->Write(
       pp_resource(), offset, buffer, bytes_to_write,
       cc.pp_completion_callback());
@@ -89,14 +89,14 @@
 int32_t FileIO::SetLength(int64_t length,
                           const CompletionCallback& cc) {
   if (!has_interface<PPB_FileIO>())
-    return PP_ERROR_NOINTERFACE;
+    return cc.MayForce(PP_ERROR_NOINTERFACE);
   return get_interface<PPB_FileIO>()->SetLength(
       pp_resource(), length, cc.pp_completion_callback());
 }
 
 int32_t FileIO::Flush(const CompletionCallback& cc) {
   if (!has_interface<PPB_FileIO>())
-    return PP_ERROR_NOINTERFACE;
+    return cc.MayForce(PP_ERROR_NOINTERFACE);
   return get_interface<PPB_FileIO>()->Flush(
       pp_resource(), cc.pp_completion_callback());
 }