WIP bindings: Add support for the record<K,V> WebIDL type.

third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp b/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
index 0ccf6f2bea17d3dae699317ce7d50db252d5a6a6..d140278f9560be4fe6b5e8243c00a2c5c479f941 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
@@ -897,6 +897,30 @@ v8::Local<v8::Object> getEsIterator(v8::Isolate* isolate,
   return iterator.As<v8::Object>();
 }
 
+v8::MaybeLocal<v8::String> getStringValueInArray(v8::Local<v8::Context> context,
+                                                 v8::Local<v8::Array> array,
+                                                 uint32_t index) {
+  v8::Local<v8::Value> value;
+  if (!array->Get(context, index).ToLocal(&value))
+    return v8::MaybeLocal<v8::String>();
+  return value->ToString(context);
+}
+
+bool isPropertyEnumerable(v8::Isolate* isolate,
+                          v8::Local<v8::Value> descriptor,
+                          ExceptionState& exceptionState) {
+  if (descriptor->IsUndefined())
+    return false;
+  if (!descriptor->IsObject())
+    return false;
+  v8::Local<v8::Value> enumerable;
+  if (!v8::Local<v8::Object>::Cast(descriptor)
+           ->Get(isolate->GetCurrentContext(), v8String(isolate, "enumerable"))
+           .ToLocal(&enumerable))
+    return false;
+  return toBoolean(isolate, enumerable, exceptionState);
+}
+
 bool addHiddenValueToArray(v8::Isolate* isolate,
                            v8::Local<v8::Object> object,
                            v8::Local<v8::Value> value,