Adding switch to toggle Memory Overlay

-> The overlay causes performance regressions so it's hard to evaluate
   performance with it on.
-> Also, the WeightWatcher is still running regardless, so you can
   always check it
-> Saved as a shared pref

Change-Id: Iad5ccbeca2c2b4e0ec86294879f3eb09caa594e9
diff --git a/src/com/android/launcher3/ToggleWeightWatcher.java b/src/com/android/launcher3/ToggleWeightWatcher.java
new file mode 100644
index 0000000..33701a2
--- /dev/null
+++ b/src/com/android/launcher3/ToggleWeightWatcher.java
@@ -0,0 +1,7 @@
+package com.android.launcher3;
+
+import android.app.Activity;
+
+public class ToggleWeightWatcher extends Activity {
+
+}