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..b9c554fbe7499b42b57e6d7ec6e07144fe618997 100644
--- a/Source/bindings/core/v8/V8Binding.cpp
+++ b/Source/bindings/core/v8/V8Binding.cpp
@@ -778,6 +778,25 @@ void crashIfV8IsDead()
     }
 }
 
+bool isValidEnum(const String value, const char** validValues, size_t length, ExceptionState& exceptionState)
+{
+    for (size_t i = 0; i < length; ++i) {
+        if (value == validValues[i])
+            return true;
+    }
+    exceptionState.throwTypeError("The provided value '" + value + "' is not a valid enum value.");
+    return false;
+}
+
+bool isValidEnum(const Vector<String>& values, const char** validValues, size_t length, ExceptionState& exceptionState)
+{
+    for (auto value : values) {
+        if (!isValidEnum(value, validValues, length, exceptionState))
+            return false;
+    }
+    return true;
+}
+
 v8::Handle<v8::Function> getBoundFunction(v8::Handle<v8::Function> function)
 {
     v8::Handle<v8::Value> boundFunction = function->GetBoundFunction();