Add Query() support to FileRef

ppapi/tests/test_utils.h

Index: ppapi/tests/test_utils.h
diff --git a/ppapi/tests/test_utils.h b/ppapi/tests/test_utils.h
index e61efbddcd5a089422f1842a25e5e87b81397ae5..37e86295094b7d6e1cda8ef26ddf55b0b406d254 100644
--- a/ppapi/tests/test_utils.h
+++ b/ppapi/tests/test_utils.h
@@ -190,7 +190,10 @@ class TestCompletionCallbackWithOutput : public TestCompletionCallback {
     return GetCallbackWithOutput();
   }
 
-  const OutputT& output() { return output_storage_.output(); }
+  OutputT output() {
+    return pp::internal::CallbackOutputTraits<OutputT>::StorageToPluginArg(
+        output_storage_);
+  }
 
   typename pp::CompletionCallbackWithOutput<OutputT>::OutputStorageType
       output_storage_;
@@ -201,10 +204,7 @@ pp::CompletionCallbackWithOutput<OutputT>
 TestCompletionCallbackWithOutput<OutputT>::GetCallbackWithOutput() {
   Reset();
   if (callback_type_ == PP_BLOCKING) {
-    pp::CompletionCallbackWithOutput<OutputT> cc(
-        &TestCompletionCallback::Handler,
-        this,
-        &output_storage_);
+    pp::CompletionCallbackWithOutput<OutputT> cc(&output_storage_);
     return cc;
   }
 
@@ -225,7 +225,8 @@ TestCompletionCallbackWithOutput<OutputT>::GetCallbackWithOutput() {
 #define CHECK_CALLBACK_BEHAVIOR(callback) \
 do { \
   if ((callback).failed()) \
-    return (callback).errors(); \
+    return MakeFailureMessage(__FILE__, __LINE__, \
+                              (callback).errors().c_str()); \
 } while (false)
 
 /*