Define generic logging class

b/26494415

Change-Id: I5fbf54eb5986eb49a62ba51d41aab43e00a9ca12
diff --git a/src/com/android/launcher3/logging/UserEventLogger.java b/src/com/android/launcher3/logging/UserEventLogger.java
new file mode 100644
index 0000000..9ab305f
--- /dev/null
+++ b/src/com/android/launcher3/logging/UserEventLogger.java
@@ -0,0 +1,7 @@
+package com.android.launcher3.logging;
+
+import com.android.launcher3.userevent.nano.LauncherLogProto;
+
+public abstract class UserEventLogger {
+    public void processEvent(LauncherLogProto proto) {}
+}
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