Dump RenderThread stack on unresponsive

 Bug: 16408405

Change-Id: I4ba4836fd1451fb8ba77c34cdb843d3cb4217bb8
diff --git a/libs/hwui/renderthread/DrawFrameTask.cpp b/libs/hwui/renderthread/DrawFrameTask.cpp
index dd34e09..763e727 100644
--- a/libs/hwui/renderthread/DrawFrameTask.cpp
+++ b/libs/hwui/renderthread/DrawFrameTask.cpp
@@ -85,8 +85,7 @@
 
 void DrawFrameTask::postAndWait() {
     AutoMutex _lock(mLock);
-    mRenderThread->queue(this);
-    mSignal.wait(mLock);
+    mRenderThread->queueAndWait(this, mSignal, mLock);
 }
 
 void DrawFrameTask::run() {