New thunk system for Pepper proxy and implementation

ppapi/thunk/ppb_graphics_2d_api.h

+// Copyright (c) 2011 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.
+
+#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"
+
+namespace ppapi {
+namespace thunk {
+
+class PPB_Graphics2D_API {
+ public:
+  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 int32_t Flush(PP_CompletionCallback callback) = 0;
+};
+
+}  // namespace thunk
+}  // namespace ppapi