Don't build bitmaps when running in GL.

Change-Id: I28c93256bca748be6a00698a6c41cbab5dd4a349
diff --git a/src/com/android/launcher2/CellLayout.java b/src/com/android/launcher2/CellLayout.java
index 9bb10fa..63da108 100644
--- a/src/com/android/launcher2/CellLayout.java
+++ b/src/com/android/launcher2/CellLayout.java
@@ -847,7 +847,9 @@
             final View view = getChildAt(i);
             view.setDrawingCacheEnabled(enabled);
             // Update the drawing caches
-            view.buildDrawingCache(true);
+            if (!view.isHardwareAccelerated()) {
+                view.buildDrawingCache(true);
+            }
         }
     }