Make DataTransferItem.getAsString() argument mandatory and nullable

Source/bindings/scripts/deprecated_code_generator_v8.pm

 # Copyright (C) 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
 # Copyright (C) 2006 Anders Carlsson <andersca@mac.com>
 # Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
 # Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
 # Copyright (C) 2006 Apple Computer, Inc.
 # Copyright (C) 2007, 2008, 2009, 2012 Google Inc.
 # Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
 # Copyright (C) Research In Motion Limited 2010. All rights reserved.
 # Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 # Copyright (C) 2012 Ericsson AB. All rights reserved.
@@ skipping 2308 matching lines @@
             if ($parameter->isOptional) {
                 $parameterCheckString .= "    RefPtr<" . $parameter->type . "> $parameterName;\n";
                 $parameterCheckString .= "    if (args.Length() > $paramIndex && !args[$paramIndex]->IsNull() && !args[$paramIndex]->IsUndefined()) {\n";
                 $parameterCheckString .= "        if (!args[$paramIndex]->IsFunction()) {\n";
                 $parameterCheckString .= "            throwTypeError(args.GetIsolate());\n";
                 $parameterCheckString .= "            return;\n";
                 $parameterCheckString .= "        }\n";
                 $parameterCheckString .= "        $parameterName = ${v8ClassName}::create(args[$paramIndex], getScriptExecutionContext());\n";
                 $parameterCheckString .= "    }\n";
             } else {
-                $parameterCheckString .= "    if (args.Length() <= $paramIndex || !args[$paramIndex]->IsFunction()) {\n";
+                $parameterCheckString .= "    if (args.Length() <= $paramIndex || ";
+                if ($parameter->isNullable) {
+                    $parameterCheckString .= "!(args[$paramIndex]->IsFunction() || args[$paramIndex]->IsNull())";
+                } else {
+                    $parameterCheckString .= "!args[$paramIndex]->IsFunction()";
+                }
+                $parameterCheckString .= ") {\n";
                 $parameterCheckString .= "        throwTypeError(args.GetIsolate());\n";
                 $parameterCheckString .= "        return;\n";
                 $parameterCheckString .= "    }\n";
-                $parameterCheckString .= "    RefPtr<" . $parameter->type . "> $parameterName = ${v8ClassName}::create(args[$paramIndex], getScriptExecutionContext());\n";
+                $parameterCheckString .= "    RefPtr<" . $parameter->type . "> $parameterName = ";
+                $parameterCheckString .= "args[$paramIndex]->IsNull() ? 0 : " if $parameter->isNullable;
+                $parameterCheckString .= "${v8ClassName}::create(args[$paramIndex], getScriptExecutionContext());\n";
             }
         } elsif ($parameter->extendedAttributes->{"Clamp"}) {
                 my $nativeValue = "${parameterName}NativeValue";
                 my $paramType = $parameter->type;
                 $parameterCheckString .= "    $paramType $parameterName = 0;\n";
                 $parameterCheckString .= "    V8TRYCATCH_VOID(double, $nativeValue, args[$paramIndex]->NumberValue());\n";
                 $parameterCheckString .= "    if (!std::isnan($nativeValue))\n";
                 $parameterCheckString .= "        $parameterName = clampTo<$paramType>($nativeValue);\n";
         } elsif ($parameter->type eq "SerializedScriptValue") {
             AddToImplIncludes("bindings/v8/SerializedScriptValue.h");
@@ skipping 3676 matching lines @@
         if ($currentInterface->extendedAttributes->{$extendedAttribute}) {
             $found = 1;
         }
         return 1 if $found;
     }, 0);
 
     return $found;
 }
 
 1;