Add gin, a lightweight bindings system for V8

gin/runner.h

Index: gin/runner.h
diff --git a/gin/runner.h b/gin/runner.h
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+// 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 GIN_RUNNER_H_
+#define GIN_RUNNER_H_
+
+#include "base/basictypes.h"
+#include "v8/include/v8.h"
+
+namespace gin {
+
+class Runner;
+
+class RunnerDelegate {
+ public:
+  // Returns the object that is passed to the script's |main| function.
+  virtual v8::Handle<v8::Object> CreateRootObject(Runner* runner) = 0;
+
+ protected:
+  virtual ~RunnerDelegate();
+};
+
+class Runner {
+ public:
+  Runner(RunnerDelegate* delegate, v8::Isolate* isolate);
+  ~Runner();
+
+  void Run(v8::Handle<v8::Script> script);
+
+  v8::Isolate* isolate() const { return isolate_; }
+
+  v8::Handle<v8::Context> context() const {
+    return v8::Local<v8::Context>::New(isolate_, context_);
+  }
+
+  v8::Handle<v8::Object> global() const {
+    return context()->Global();
+  }
+
+  class Scope {
+   public:
+    explicit Scope(Runner* runner);
+    ~Scope();
+
+   private:
+    v8::HandleScope handle_scope_;
+    v8::Context::Scope scope_;
+
+    DISALLOW_COPY_AND_ASSIGN(Scope);
+  };
+
+ private:
+  friend class Scope;
+
+  v8::Handle<v8::Function> GetMain();
+
+  RunnerDelegate* delegate_;
+  v8::Isolate* isolate_;
+  v8::Persistent<v8::Context> context_;
+
+  DISALLOW_COPY_AND_ASSIGN(Runner);
+};
+
+}  // namespace gin
+
+#endif  // GIN_RUNNER_H_