Fix threading issues

Bug: 25584167
Change-Id: I413ef9e0c86f7cca1f7d085e0071745ca0192853
diff --git a/libs/hwui/renderthread/RenderProxy.h b/libs/hwui/renderthread/RenderProxy.h
index d0e601e..338fab6 100644
--- a/libs/hwui/renderthread/RenderProxy.h
+++ b/libs/hwui/renderthread/RenderProxy.h
@@ -117,6 +117,9 @@
 
     DrawFrameTask mDrawFrameTask;
 
+    Mutex mSyncMutex;
+    Condition mSyncCondition;
+
     void destroyContext();
 
     void post(RenderTask* task);