Begin implementing V8 bindings for Mojo

mojo/public/bindings/js/v8_conversions.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_PUBLIC_BINDINGS_JS_V8_CONVERSIONS_H_
+#define MOJO_PUBLIC_BINDINGS_JS_V8_CONVERSIONS_H_
+
+#include <vector>
+
+#include "v8/include/v8.h"
+
+namespace mojo {
+namespace js {
+
+template<typename T>
+bool ToNativeArray(v8::Handle<v8::Array> array, std::vector<T>* result) {
+  uint32_t length = array->Length();
+  result->reserve(length);
+  for (uint32_t i = 0; i < length; ++i) {
+    v8::Handle<v8::Value> value = array->Get(i);
+    if (!value->IsObject())
+      return false;
+    v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(value);
+    if (!Wrapper<T>::HasInstance(object))
+      return false;
+    result->push_back(Wrapper<T>::ToNative(object));
+  }
+  return true;
+}
+
+template<typename T>
+v8::Handle<v8::Array> ToObjectArray(v8::Isolate* isolate,
+                                    const std::vector<T>& native) {
+  uint32_t length = native.size();
+  v8::Handle<v8::Array> result = v8::Array::New(length);
+  for (uint32_t i = 0; i < length; ++i) {
+    result->Set(i, Wrapper<T>::ToObject(isolate, native[i]));
+  }
+  return result;
+}
+
+}  // namespace js
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_BINDINGS_JS_V8_CONVERSIONS_H_