Implement File constructor.

Source/bindings/v8/V8BindingMacros.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 24 matching lines @@
 
 #define V8TRYCATCH(type, var, value) \
     type var;                             \
     {                                     \
         v8::TryCatch block;               \
         var = (value);                    \
         if (block.HasCaught())            \
             return block.ReThrow();       \
     }
 
+#define V8TRYCATCH_RETURN(type, var, value, retVal) \
+    type var;                                       \
+    {                                               \
+        v8::TryCatch block;                         \
+        var = (value);                              \
+        if (block.HasCaught()) {                    \
+            block.ReThrow();                        \
+            return retVal;                          \
+        }                                           \
+    }
+
 #define V8TRYCATCH_VOID(type, var, value) \
     type var;                             \
     {                                     \
         v8::TryCatch block;               \
         var = (value);                    \
         if (block.HasCaught()) {          \
             block.ReThrow();              \
             return;                       \
         }                                 \
     }
@@ skipping 22 matching lines @@
         return retVal;
 
 #define V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(type, var, value) \
     type var(value);                                                 \
     if (!var.prepare())                                              \
         return;
 
 } // namespace WebCore
 
 #endif // V8BindingMacros_h