pref for html5 prefetch bandwidth management

Bug: 5218987
Change-Id: Ifeb9a1b3d71ac83b8ad94a8f31ed324ebd5d0fe7
diff --git a/src/com/android/browser/PreferenceKeys.java b/src/com/android/browser/PreferenceKeys.java
index 1a20495..ff42aaf 100644
--- a/src/com/android/browser/PreferenceKeys.java
+++ b/src/com/android/browser/PreferenceKeys.java
@@ -102,6 +102,7 @@
     // Keys for bandwidth_preferences.xml
     // ----------------------
     static final String PREF_DATA_PRELOAD = "preload_when";
+    static final String PREF_LINK_PREFETCH = "link_prefetch_when";
     static final String PREF_LOAD_IMAGES = "load_images";
 
     // ----------------------