Introduce gin_shell

gin/runner.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 GIN_RUNNER_H_
 #define GIN_RUNNER_H_
 
 #include <string>
+#include "base/memory/weak_ptr.h"
 #include "gin/context_holder.h"
 
 namespace gin {
 
 class Runner;
+class TryCatch;
 
 class RunnerDelegate {
  public:
   RunnerDelegate();
   virtual ~RunnerDelegate();
 
   // Returns the template for the global object.
   virtual v8::Handle<v8::ObjectTemplate> GetGlobalTemplate(Runner* runner);
-
   virtual void DidCreateContext(Runner* runner);
+  virtual void WillRunScript(Runner* runner, v8::Handle<v8::Script> script);
+  virtual void DidRunScript(Runner* runner, v8::Handle<v8::Script> script);
+  virtual void UnhandledException(Runner* runner, TryCatch& try_catch);
 };
 
 class Runner : public ContextHolder {
  public:
   Runner(RunnerDelegate* delegate, v8::Isolate* isolate);
   ~Runner();
 
   void Run(const std::string& script);
   void Run(v8::Handle<v8::Script> script);
 
   v8::Handle<v8::Object> global() const {
     return context()->Global();
   }
 
+  base::WeakPtr<Runner> GetWeakPtr() {
+    return weak_factory_.GetWeakPtr();
+  }
+
   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;
 
   RunnerDelegate* delegate_;
 
+  base::WeakPtrFactory<Runner> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(Runner);
 };
 
 }  // namespace gin
 
 #endif  // GIN_RUNNER_H_