Migrate Graphics2D to new design.

ppapi/thunk/ppb_graphics_2d_api.h

Index: ppapi/thunk/ppb_graphics_2d_api.h
diff --git a/ppapi/thunk/ppb_graphics_2d_api.h b/ppapi/thunk/ppb_graphics_2d_api.h
index 6f14b936fde195b6e0ad69a599af7ddb7aeac03a..e6357c3e4d2293b58fe3221acf16732d4823bb53 100644
--- a/ppapi/thunk/ppb_graphics_2d_api.h
+++ b/ppapi/thunk/ppb_graphics_2d_api.h
@@ -2,6 +2,9 @@
 // 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"
@@ -9,6 +12,7 @@
 #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 {
 
@@ -16,7 +20,7 @@ class TrackedCallback;
 
 namespace thunk {
 
-class PPB_Graphics2D_API {
+class PPAPI_THUNK_EXPORT PPB_Graphics2D_API {
  public:
   virtual ~PPB_Graphics2D_API() {}
 
@@ -41,7 +45,12 @@ class PPB_Graphics2D_API {
   // 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_