bindings: Add validation for enum Sequence or Array

Source/bindings/core/v8/V8Binding.cpp

Index: Source/bindings/core/v8/V8Binding.cpp
diff --git a/Source/bindings/core/v8/V8Binding.cpp b/Source/bindings/core/v8/V8Binding.cpp
index b288a2950186d5b88766aa9ae4837cccb0b2bdc9..d1da5496131ffdde2f88749d28c86c16b272f00e 100644
--- a/Source/bindings/core/v8/V8Binding.cpp
+++ b/Source/bindings/core/v8/V8Binding.cpp
@@ -74,6 +74,18 @@
 
 namespace blink {
 
+String toCoreString(v8::Isolate* isolate, v8::Local<v8::Value> value)
+{
+    if (value.IsEmpty())
+        return String();
+    if (value->IsString())
+        return toCoreString(value.As<v8::String>());
+    v8::Local<v8::String> stringValue;
+    if (!value->ToString(isolate->GetCurrentContext()).ToLocal(&stringValue))
+        return String();
+    return toCoreString(stringValue);
+}
+
 void setArityTypeError(ExceptionState& exceptionState, const char* valid, unsigned provided)
 {
     exceptionState.throwTypeError(ExceptionMessages::invalidArity(valid, provided));
@@ -778,6 +790,24 @@ void crashIfV8IsDead()
     }
 }
 
+bool isValidEnum(const String value, const char** validValues, size_t length)
+{
+    for (size_t i = 0; i < length; ++i) {
+        if (value == validValues[i])
+            return true;
+    }
+    return false;
+}
+
+bool isValidEnum(const Vector<String>& values, const char** validValues, size_t length)
+{
+    for (auto value : values) {
+        if (!isValidEnum(value, validValues, length))
+            return false;
+    }
+    return true;
+}
+
 v8::Handle<v8::Function> getBoundFunction(v8::Handle<v8::Function> function)
 {
     v8::Handle<v8::Value> boundFunction = function->GetBoundFunction();