IDL: make optional arguments (without default) explicit sometimes

Source/bindings/core/v8/V8ScriptRunner.cpp

 /*
  * Copyright (C) 2009 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 22 matching lines @@
 #include "bindings/core/v8/V8ThrowException.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/fetch/CachedMetadata.h"
 #include "core/fetch/ScriptResource.h"
 #include "platform/TraceEvent.h"
 
 namespace blink {
 
 namespace {
 
+const int kMaxRecursionDepth = 22;
+
 // In order to make sure all pending messages to be processed in
 // v8::Function::Call, we don't call handleMaxRecursionDepthExceeded
 // directly. Instead, we create a v8::Function of
 // throwStackOverflowException and call it.
 void throwStackOverflowException(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     V8ThrowException::throwRangeError("Maximum call stack size exceeded.", info.GetIsolate());
 }
 
 v8::Local<v8::Value> throwStackOverflowExceptionIfNeeded(v8::Isolate* isolate)
@@ skipping 215 matching lines @@
 {
     TRACE_EVENT0("v8", "v8.newInstance");
     TRACE_EVENT_SCOPED_SAMPLING_STATE("v8", "V8Execution");
     V8RecursionScope scope(isolate, context);
     v8::Local<v8::Object> result = function->NewInstance(argc, argv);
     crashIfV8IsDead();
     return result;
 }
 
 } // namespace blink