Refactors parts of gin:

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/gin_export.h"
 #include "gin/public/context_holder.h"
+#include "v8/include/v8.h"
 
 namespace gin {
 
-class Runner;
-class TryCatch;
-
-// Subclass RunnerDelegate to customize the behavior of |Runner|. Typical
-// embedders will want to subclass one of the specialized RunnerDelegates,
-// such as ModuleRunnerDelegate.
-class GIN_EXPORT RunnerDelegate {
+// Runner is responsible for running code in a v8::Context.
+class GIN_EXPORT Runner {
  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);
-  virtual void DidRunScript(Runner* runner);
-  virtual void UnhandledException(Runner* runner, TryCatch& try_catch);
-};
-
-// Runner lets you run code in a v8::Context. Upon construction, Runner will
-// create a v8::Context. Upon destruction, Runner will dispose the context.
-class GIN_EXPORT Runner : public ContextHolder {
- public:
-  Runner(RunnerDelegate* delegate, v8::Isolate* isolate);
-  ~Runner();
+  Runner();
+  virtual ~Runner();
 
   // Before running script in this context, you'll need to enter the runner's
   // context by creating an instance of Runner::Scope on the stack.
-  void Run(const std::string& source, const std::string& resource_name);
-  void Run(v8::Handle<v8::Script> script);
+  virtual void Run(const std::string& source,
+                   const std::string& resource_name) = 0;
+  virtual v8::Handle<v8::Value> Call(v8::Handle<v8::Function> function,
+                                     v8::Handle<v8::Value> receiver,
+                                     int argc,
+                                     v8::Handle<v8::Value> argv[]) = 0;
+  virtual ContextHolder* GetContextHolder() = 0;
 
-  v8::Handle<v8::Value> Call(v8::Handle<v8::Function> function,
-                             v8::Handle<v8::Value> receiver,
-                             int argc,
-                             v8::Handle<v8::Value> argv[]);
-
-  v8::Handle<v8::Object> global() const {
-    return context()->Global();
+  v8::Handle<v8::Object> global() {
+    return GetContextHolder()->context()->Global();
   }
 
   // Useful for running script in this context asynchronously. Rather than
   // holding a raw pointer to the runner, consider holding a WeakPtr.
   base::WeakPtr<Runner> GetWeakPtr() {
     return weak_factory_.GetWeakPtr();
   }
 
   class GIN_EXPORT Scope {
    public:
     explicit Scope(Runner* runner);
     ~Scope();
 
    private:
     v8::Isolate::Scope isolate_scope_;
     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_