Serializing display lists

This is a WIP prototype

Change-Id: Id4bfcf2b7bf905221c3734b7b6887c9b2efd37e6
diff --git a/libs/hwui/renderthread/RenderProxy.h b/libs/hwui/renderthread/RenderProxy.h
index 0d2c7be..e7356db 100644
--- a/libs/hwui/renderthread/RenderProxy.h
+++ b/libs/hwui/renderthread/RenderProxy.h
@@ -104,6 +104,8 @@
     ANDROID_API void setTextureAtlas(const sp<GraphicBuffer>& buffer, int64_t* map, size_t size);
     ANDROID_API void setProcessStatsBuffer(int fd);
 
+    ANDROID_API void serializeDisplayListTree();
+
 private:
     RenderThread& mRenderThread;
     CanvasContext* mContext;