bindings: Make the sequence conversion code more complaint with WebIDL.

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 886 matching lines @@
     exception_state.RethrowV8Exception(block.Exception());
     return v8::Local<v8::Object>();
   }
   if (!iterator->IsObject()) {
     exception_state.ThrowTypeError("Iterator is not an object.");
     return v8::Local<v8::Object>();
   }
   return iterator.As<v8::Object>();
 }
 
+bool IsV8Sequence(v8::Isolate* isolate,
+                  v8::Local<v8::Value> value,
+                  ExceptionState& exception_state) {
+  if (!value->IsObject())
+    return false;
+  v8::TryCatch block(isolate);
+  v8::Local<v8::Context> context = isolate->GetCurrentContext();
+  v8::Local<v8::Value> iterator_getter;
+  if (!value.As<v8::Object>()
+           ->Get(context, v8::Symbol::GetIterator(isolate))
+           .ToLocal(&iterator_getter)) {
+    exception_state.RethrowV8Exception(block.Exception());
+    return false;
+  }
+  return iterator_getter->IsFunction();
+}
+
 bool AddHiddenValueToArray(v8::Isolate* isolate,
                            v8::Local<v8::Object> object,
                            v8::Local<v8::Value> value,
                            int array_index) {
   ASSERT(!value.IsEmpty());
   v8::Local<v8::Value> array_value = object->GetInternalField(array_index);
   if (array_value->IsNull() || array_value->IsUndefined()) {
     array_value = v8::Array::New(isolate);
     object->SetInternalField(array_index, array_value);
   }
@@ skipping 71 matching lines @@
   if (!V8Call(v8::JSON::Parse(isolate, V8String(isolate, stringified_json)),
               parsed, try_catch)) {
     if (try_catch.HasCaught())
       exception_state.RethrowV8Exception(try_catch.Exception());
   }
 
   return parsed;
 }
 
 }  // namespace blink