Fix RenderThread setForLooper

RenderThread doesn't use ThreadBase::threadLoop
so it also needs to explicitly Looper::setForLooper

Fixes: 124467483
Test: hwuiunit
Change-Id: I3703b5d3dbbbaa68e88fc23756dfccacfce863cb
diff --git a/libs/hwui/renderthread/RenderThread.cpp b/libs/hwui/renderthread/RenderThread.cpp
index fc63819..bfae80f 100644
--- a/libs/hwui/renderthread/RenderThread.cpp
+++ b/libs/hwui/renderthread/RenderThread.cpp
@@ -346,6 +346,7 @@
 
 bool RenderThread::threadLoop() {
     setpriority(PRIO_PROCESS, 0, PRIORITY_DISPLAY);
+    Looper::setForThread(mLooper);
     if (gOnStartHook) {
         gOnStartHook("RenderThread");
     }