[gin] Turn gin into a component

gin/per_context_data.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_PER_CONTEXT_DATA_H_
 #define GIN_PER_CONTEXT_DATA_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
+#include "gin/gin_export.h"
 #include "v8/include/v8.h"
 
 namespace gin {
 
 class Runner;
 
 // Embedders can store additional per-context data by subclassing
 // ContextSupplement.
-class ContextSupplement {
+class GIN_EXPORT ContextSupplement {
  public:
   ContextSupplement();
   virtual ~ContextSupplement();
 
   // Detach will be called before ContextHolder disposes the v8::Context.
   // Embedders should not interact with |context| after Detach has been called.
   virtual void Detach(v8::Handle<v8::Context> context) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ContextSupplement);
 };
 
 // There is one instance of PerContextData per v8::Context managed by Gin. This
 // class stores all the Gin-related data that varies per context.
-class PerContextData {
+class GIN_EXPORT PerContextData {
  public:
   explicit PerContextData(v8::Handle<v8::Context> context);
   ~PerContextData();
 
   // Can return NULL after the ContextHolder has detached from context.
   static PerContextData* From(v8::Handle<v8::Context>);
   void Detach(v8::Handle<v8::Context> context);
 
   // The Runner associated with this context. To execute script in this context,
   // please use the appropriate API on Runner.
   Runner* runner() const { return runner_; }
   void set_runner(Runner* runner) { runner_ = runner; }
 
   void AddSupplement(scoped_ptr<ContextSupplement> supplement);
 
  private:
   typedef ScopedVector<ContextSupplement> SuplementVector;
 
   Runner* runner_;
   SuplementVector supplements_;
 
   DISALLOW_COPY_AND_ASSIGN(PerContextData);
 };
 
 }  // namespace gin
 
 #endif  // GIN_PER_CONTEXT_DATA_H_