Migrate Graphics2D to new design.

ppapi/thunk/ppb_graphics_2d_api.h

 // Copyright (c) 2012 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 PPAPI_THUNK_PPB_GRAPHICS_2D_API_H_
+#define PPAPI_THUNK_PPB_GRAPHICS_2D_API_H_
+
 #include "base/memory/ref_counted.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_point.h"
 #include "ppapi/c/pp_rect.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_size.h"
+#include "ppapi/thunk/ppapi_thunk_export.h"
 
 namespace ppapi {
 
 class TrackedCallback;
 
 namespace thunk {
 
-class PPB_Graphics2D_API {
+class PPAPI_THUNK_EXPORT PPB_Graphics2D_API {
  public:
   virtual ~PPB_Graphics2D_API() {}
 
   virtual PP_Bool Describe(PP_Size* size, PP_Bool* is_always_opaque) = 0;
   virtual void PaintImageData(PP_Resource image_data,
                               const PP_Point* top_left,
                               const PP_Rect* src_rect) = 0;
   virtual void Scroll(const PP_Rect* clip_rect,
                       const PP_Point* amount) = 0;
   virtual void ReplaceContents(PP_Resource image_data) = 0;
   virtual bool SetScale(float scale) = 0;
   virtual float GetScale() = 0;
 
   // When |old_image_data| is non-null and the flush is executing a replace
   // contents (which leaves the "old" ImageData unowned), the resource ID of
   // the old image data will be placed into |*old_image_data| synchronously
   // (not when the flush callback completes).
   //
   // When this happens, a reference to this resource will be transferred to the
   // caller. If there is no replace contents operation, old_image_data will be
   // ignored. If |*old_image_data| is null, then the old image data will be
   // destroyed if there was one.
   virtual int32_t Flush(scoped_refptr<TrackedCallback> callback,
                         PP_Resource* old_image_data) = 0;
+
+  // Test only
+  virtual bool ReadImageData(PP_Resource image, const PP_Point* top_left) = 0;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
+
+#endif  // PPAPI_THUNK_PPB_GRAPHICS_2D_API_H_