Migrate Graphics2D to new design.

ppapi/thunk/ppb_image_data_api.h

Index: ppapi/thunk/ppb_image_data_api.h
diff --git a/ppapi/thunk/ppb_image_data_api.h b/ppapi/thunk/ppb_image_data_api.h
index 32166c7ccd34277a933f63367644bbd8eb91f3d2..954630448b33b5abc849ed8b773b18754bd6989a 100644
--- a/ppapi/thunk/ppb_image_data_api.h
+++ b/ppapi/thunk/ppb_image_data_api.h
@@ -42,6 +42,11 @@ class PPB_ImageData_API {
   //   * If the image is not mapped.
   //   * Within untrusted code (which does not have skia).
   virtual SkCanvas* GetCanvas() = 0;
+
+  // Sets whether this image was used in a ReplaceContents call. If the
+  // current implementation supports image data recycling (only supported
+  // out-of-process then it will be marked for potential re-use.
+  virtual void SetUsedInReplaceContents() = 0;
 };
 
 }  // namespace thunk