Keep a persistent handle for the bindings classes to avoid repeated lookups that involve performing…

Source/bindings/dart/DartDOMWrapper.cpp

Index: Source/bindings/dart/DartDOMWrapper.cpp
diff --git a/Source/bindings/dart/DartDOMWrapper.cpp b/Source/bindings/dart/DartDOMWrapper.cpp
index e26835cefbe34bf556f794747cc6993e17885756..3f51bc5a3e351fbc1f613783666331508f4a63d3 100644
--- a/Source/bindings/dart/DartDOMWrapper.cpp
+++ b/Source/bindings/dart/DartDOMWrapper.cpp
@@ -43,37 +43,29 @@
 
 namespace WebCore {
 
-Dart_Handle DartDOMWrapper::instantiateWrapper(const char* className, const char* libraryName)
+Dart_Handle DartDOMWrapper::dartClass(const char* className, const char* libraryName, intptr_t index)
 {
-    Dart_Handle library = DartUtilities::libraryForCurrentIsolate(libraryName);
-    ASSERT(!Dart_IsError(library));
+    ASSERT(index < NumWebkitClassIds);
 
-    Dart_Handle type = Dart_GetType(library, Dart_NewStringFromCString(className), 0, 0);
-    ASSERT(!Dart_IsError(type));
+    ClassTable* table = DartDOMData::current()->classHandleCache();
 
-    Dart_Handle instance = Dart_Allocate(type);
-    ASSERT(!Dart_IsError(instance));
+    Dart_Handle type;
+    Dart_PersistentHandle persistentType = (*table)[index];
 
-    return instance;
-}
+    if (persistentType) {
+        type = Dart_HandleFromPersistent(persistentType);
+    } else {
+        Dart_Handle library = DartUtilities::libraryForCurrentIsolate(libraryName);
+        ASSERT(!Dart_IsError(library));
 
-bool DartDOMWrapper::instanceOf(const char* className, const char* libraryName, Dart_Handle wrapper)
-{
-    // FIXME(rmacnak): Cache classes in the corresponding bindings class. Requires persistent handles.
-    Dart_Handle library = DartUtilities::libraryForCurrentIsolate(libraryName);
-    ASSERT(!Dart_IsError(library));
-
-    Dart_Handle type = Dart_GetType(library, Dart_NewStringFromCString(className), 0, 0);
-    ASSERT(!Dart_IsError(type));
-    if (Dart_IsError(type))
-        return false;
-
-    bool isInstanceOf = false;
-    Dart_Handle result = Dart_ObjectIsType(wrapper, type, &isInstanceOf);
-    ASSERT(!Dart_IsError(result));
-    if (Dart_IsError(result))
-        return false;
-    return isInstanceOf;
+        type = Dart_GetType(library, Dart_NewStringFromCString(className), 0, 0);
+        ASSERT(!Dart_IsError(type));
+
+        persistentType = Dart_NewPersistentHandle(type);
+        (*table)[index] = persistentType;
+    }
+
+    return type;
 }
 
 Dart_Handle DartDOMWrapper::exceptionCodeToDartException(ExceptionCode exceptionCode)