Begin implementing V8 bindings for Mojo

mojo/public/bindings/js/v8_runner.cc

Index: mojo/public/bindings/js/v8_runner.cc
diff --git a/mojo/public/bindings/js/v8_runner.cc b/mojo/public/bindings/js/v8_runner.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ee6c532bfa7ee4d1457fb424329cd2b1fd7869c1
--- /dev/null
+++ b/mojo/public/bindings/js/v8_runner.cc
@@ -0,0 +1,50 @@
+// 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.
+
+#include "mojo/public/bindings/js/v8_runner.h"
+
+#include "mojo/public/bindings/js/v8_per_isolate_data.h"
+
+namespace mojo {
+namespace js {
+
+Runner::Runner(v8::Isolate* isolate)
+    : isolate_(isolate) {
+  v8::HandleScope handle_scope(isolate_);
+  context_.Reset(isolate_, v8::Context::New(isolate_));
+}
+
+Runner::~Runner() {
+  // TODO(abarth): Figure out how to set kResetInDestructor to true.
+  context_.Reset();
+}
+
+void Runner::Run(v8::Handle<v8::Script> script) {
+  V8PerIsolateData* data = V8PerIsolateData::From(isolate_);
+  v8::Handle<v8::Object> mojo = data->mojo_template()->NewInstance();
+
+  script->Run();
+
+  v8::Handle<v8::Context> context = v8::Local<v8::Context>::New(isolate_,
+                                                                context_);
+  v8::Handle<v8::Object> global = context->Global();
+  v8::Handle<v8::Value> main_value = global->Get(v8::String::New("main"));
+  if (main_value.IsEmpty() || !main_value->IsFunction())
+    return;
+  v8::Handle<v8::Function> main = v8::Handle<v8::Function>::Cast(main_value);
+
+  v8::Handle<v8::Value> argv[] = { mojo };
+  main->Call(global, 1, argv);
+}
+
+Runner::Scope::Scope(Runner* runner)
+  : handle_scope_(runner->isolate_),
+    scope_(v8::Local<v8::Context>::New(runner->isolate_, runner->context_)) {
+}
+
+Runner::Scope::~Scope() {
+}
+
+}  // namespace js
+}  // namespace mojo