Renamed renderPreview to requestPreview

Bug: 185198554
Test: manual
Change-Id: Iad8d45ab54c0ed6e13809a2be33b788731c281e9
diff --git a/src/com/android/customization/picker/grid/GridOptionPreviewer.java b/src/com/android/customization/picker/grid/GridOptionPreviewer.java
index fdefa05..77fdc43 100644
--- a/src/com/android/customization/picker/grid/GridOptionPreviewer.java
+++ b/src/com/android/customization/picker/grid/GridOptionPreviewer.java
@@ -89,7 +89,7 @@
         }
 
         @Override
-        protected Bundle renderPreview(SurfaceView workspaceSurface) {
+        protected Bundle requestPreview(SurfaceView workspaceSurface) {
             return mGridManager.renderPreview(
                     SurfaceViewUtils.createSurfaceViewRequest(workspaceSurface),
                     mGridOption.name);