DO NOT MERGE Add back Yenta experiment (1/2)

This reverts commit b7257d86f2d99ad2db6fee9f4d665db07e27f9b5.

Test: enable yenta experiement and do a few searches
Bug: 33387897
Change-Id: I34bec0c7820e8d32c53bb8ac42b24787e4dc03b5
diff --git a/src/com/android/contacts/Experiments.java b/src/com/android/contacts/Experiments.java
index 2485210..c371a3e 100644
--- a/src/com/android/contacts/Experiments.java
+++ b/src/com/android/contacts/Experiments.java
@@ -49,6 +49,16 @@
     public static final String PULL_TO_REFRESH_CANCEL_REFRESH_MILLIS =
             "PullToRefresh__cancel_refresh_millis";
 
+    /**
+     * Search study boolean indicating whether to inject yenta search results before CP2 results.
+     */
+    public static final String SEARCH_YENTA = "Search__yenta";
+
+    /**
+     * The time to wait for Yenta search results before giving up.
+     */
+    public static final String SEARCH_YENTA_TIMEOUT_MILLIS = "Search__yenta_timeout";
+
     private Experiments() {
     }
 }