Add [CachedAccessor] attribute to cache (almost) constant accessors (window.document).

third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp b/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
index 5a986f739091bd959d72f0229f4121a53a09c62f..3f91d839ca044b948ab6753f86b9ef0ac00ed9ce 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
@@ -90,15 +90,21 @@ void installAttributeInternal(v8::Isolate* isolate, v8::Local<v8::Object> instan
         NOTREACHED();
 }
 
-template<class FunctionOrTemplate>
-v8::Local<FunctionOrTemplate> createAccessorFunctionOrTemplate(v8::Isolate*, v8::FunctionCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature>, int length);
+template <class FunctionOrTemplate>
+v8::Local<FunctionOrTemplate> createAccessorFunctionOrTemplate(v8::Isolate*, v8::FunctionCallback, V8DOMConfiguration::CachedAccessorCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature>, int length);
 
-template<>
-v8::Local<v8::FunctionTemplate> createAccessorFunctionOrTemplate<v8::FunctionTemplate>(v8::Isolate* isolate, v8::FunctionCallback callback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
+template <>
+v8::Local<v8::FunctionTemplate> createAccessorFunctionOrTemplate<v8::FunctionTemplate>(v8::Isolate* isolate, v8::FunctionCallback callback, V8DOMConfiguration::CachedAccessorCallback cachedAccessorCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
 {
     v8::Local<v8::FunctionTemplate> functionTemplate;
     if (callback) {
-        functionTemplate = v8::FunctionTemplate::New(isolate, callback, data, signature, length);
+        if (cachedAccessorCallback) {
+            functionTemplate = v8::FunctionTemplate::NewWithCache(isolate, callback,
+                cachedAccessorCallback(isolate), data, signature, length);
+        } else {
+            functionTemplate = v8::FunctionTemplate::New(isolate, callback, data, signature, length);
+        }
+
         if (!functionTemplate.IsEmpty()) {
             functionTemplate->RemovePrototype();
             functionTemplate->SetAcceptAnyReceiver(false);
@@ -107,13 +113,13 @@ v8::Local<v8::FunctionTemplate> createAccessorFunctionOrTemplate<v8::FunctionTem
     return functionTemplate;
 }
 
-template<>
-v8::Local<v8::Function> createAccessorFunctionOrTemplate<v8::Function>(v8::Isolate* isolate, v8::FunctionCallback callback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
+template <>
+v8::Local<v8::Function> createAccessorFunctionOrTemplate<v8::Function>(v8::Isolate* isolate, v8::FunctionCallback callback, V8DOMConfiguration::CachedAccessorCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
 {
     if (!callback)
         return v8::Local<v8::Function>();
 
-    v8::Local<v8::FunctionTemplate> functionTemplate = createAccessorFunctionOrTemplate<v8::FunctionTemplate>(isolate, callback, data, signature, length);
+    v8::Local<v8::FunctionTemplate> functionTemplate = createAccessorFunctionOrTemplate<v8::FunctionTemplate>(isolate, callback, nullptr, data, signature, length);
     if (functionTemplate.IsEmpty())
         return v8::Local<v8::Function>();
 
@@ -150,8 +156,8 @@ void installAccessorInternal(v8::Isolate* isolate, v8::Local<ObjectOrTemplate> i
     DCHECK(accessor.propertyLocationConfiguration);
     if (accessor.propertyLocationConfiguration &
         (V8DOMConfiguration::OnInstance | V8DOMConfiguration::OnPrototype)) {
-        v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, data, signature, 0);
-        v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, data, signature, 1);
+        v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, accessor.cachedAccessorCallback, data, signature, 0);
+        v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, nullptr, data, signature, 1);
         if (accessor.propertyLocationConfiguration & V8DOMConfiguration::OnInstance)
             instanceOrTemplate->SetAccessorProperty(name, getter, setter, static_cast<v8::PropertyAttribute>(accessor.attribute), static_cast<v8::AccessControl>(accessor.settings));
         if (accessor.propertyLocationConfiguration & V8DOMConfiguration::OnPrototype)
@@ -161,8 +167,8 @@ void installAccessorInternal(v8::Isolate* isolate, v8::Local<ObjectOrTemplate> i
         // Attributes installed on the interface object must be static
         // attributes, so no need to specify a signature, i.e. no need to do
         // type check against a holder.
-        v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, data, v8::Local<v8::Signature>(), 0);
-        v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, data, v8::Local<v8::Signature>(), 1);
+        v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, nullptr, data, v8::Local<v8::Signature>(), 0);
+        v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, nullptr, data, v8::Local<v8::Signature>(), 1);
         interfaceOrTemplate->SetAccessorProperty(name, getter, setter, static_cast<v8::PropertyAttribute>(accessor.attribute), static_cast<v8::AccessControl>(accessor.settings));
     }
 }