IDL: Support [DeprecateAs] and [MeasureAs] on constants

Source/bindings/core/v8/V8DOMConfiguration.cpp

 /*
  * Copyright (C) 2012 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
@@ skipping 52 matching lines @@
         }
         v8::Local<v8::FunctionTemplate> setter;
         if (setterCallback) {
             setter = v8::FunctionTemplate::New(isolate, setterCallback, v8::External::New(isolate, const_cast<WrapperTypeInfo*>(accessors[i].data)), signature, 1);
             setter->RemovePrototype();
         }
         prototype->SetAccessorProperty(v8AtomicString(isolate, accessors[i].name), getter, setter, accessors[i].attribute, accessors[i].settings);
     }
 }
 
+// Constant installation
+//
+// installConstants() is be used for simple constants. It installs constants
+// using v8::Template::Set(), which results in a property that is much faster to
+// access from scripts.
+// installConstant() is used when some C++ code needs to be executed when the
+// constant is accessed, e.g. to handle deprecation or measuring usage. The
+// property appears the same to scripts, but is slower to access.
+
 void V8DOMConfiguration::installConstants(v8::Handle<v8::FunctionTemplate> functionDescriptor, v8::Handle<v8::ObjectTemplate> prototype, const ConstantConfiguration* constants, size_t constantCount, v8::Isolate* isolate)
 {
     for (size_t i = 0; i < constantCount; ++i) {
         const ConstantConfiguration* constant = &constants[i];
         v8::Handle<v8::String> constantName = v8AtomicString(isolate, constant->name);
         switch (constant->type) {
         case ConstantTypeShort:
         case ConstantTypeLong:
         case ConstantTypeUnsignedShort:
             functionDescriptor->Set(constantName, v8::Integer::New(isolate, constant->ivalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
@@ skipping 11 matching lines @@
         case ConstantTypeString:
             functionDescriptor->Set(constantName, v8::String::NewFromUtf8(isolate, constant->svalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
             prototype->Set(constantName, v8::String::NewFromUtf8(isolate, constant->svalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
             break;
         default:
             ASSERT_NOT_REACHED();
         }
     }
 }
 
+void V8DOMConfiguration::installConstant(v8::Handle<v8::FunctionTemplate> functionDescriptor, v8::Handle<v8::ObjectTemplate> prototype, const char* name, v8::AccessorGetterCallback getter, v8::Isolate* isolate)
+{
+    v8::Handle<v8::String> constantName = v8AtomicString(isolate, name);
+    functionDescriptor->SetNativeDataProperty(constantName, getter, 0, v8::Handle<v8::Value>(), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
+    prototype->SetNativeDataProperty(constantName, getter, 0, v8::Handle<v8::Value>(), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
+}
+
 void V8DOMConfiguration::installMethods(v8::Handle<v8::ObjectTemplate> prototype, v8::Handle<v8::Signature> signature, v8::PropertyAttribute attributes, const MethodConfiguration* callbacks, size_t callbackCount, v8::Isolate* isolate)
 {
     for (size_t i = 0; i < callbackCount; ++i)
         installMethod(prototype, signature, attributes, callbacks[i], isolate);
 }
 
 v8::Handle<v8::FunctionTemplate> V8DOMConfiguration::functionTemplateForCallback(v8::Handle<v8::Signature> signature, v8::FunctionCallback callback, int length, v8::Isolate* isolate)
 {
     v8::Local<v8::FunctionTemplate> functionTemplate = v8::FunctionTemplate::New(isolate, callback, v8Undefined(), signature, length);
     functionTemplate->RemovePrototype();
@@ skipping 36 matching lines @@
         return result;
 
     TRACE_EVENT_SCOPED_SAMPLING_STATE("blink", "BuildDOMTemplate");
     result = v8::FunctionTemplate::New(isolate, V8ObjectConstructor::isValidConstructorMode);
     configureDOMClassTemplate(result, isolate);
     data->setDOMTemplate(wrapperTypeInfo, result);
     return result;
 }
 
 } // namespace blink