Add possibility to divide chrome users into groups of equal size, and change ...

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
===================================================================
--- chrome/common/pref_names.cc	(revision 72341)
+++ chrome/common/pref_names.cc	(working copy)
@@ -1022,17 +1022,28 @@
 const char kNTPCustomLogoStart[] = "ntp.alt_logo_start";
 const char kNTPCustomLogoEnd[] = "ntp.alt_logo_end";
 
+// Whether promo should be shown to Dev builds, Beta and Dev, or all builds.
+const char kNTPPromoBuild[] = "ntp.promo_build";
+
+// True if user has explicitly closed the promo line.
+const char kNTPPromoClosed[] = "ntp.promo_closed";
+
+// Users are randomly divided into 16 groups in order to slowly roll out
+// special promos.
+const char kNTPPromoGroup[] = "ntp.promo_group";
+
+// Amount of time each promo group should be shown a promo that is being slowly
+// rolled out, in hours.
+const char kNTPPromoGroupTimeSlice[] = "ntp.promo_group_timeslice";
+
+// Promo line from server.
+const char kNTPPromoLine[] = "ntp.promo_line";
+
 // Dates between which the NTP should show a promotional line downloaded
 // from the promo server.
 const char kNTPPromoStart[] = "ntp.promo_start";
 const char kNTPPromoEnd[] = "ntp.promo_end";
 
-// Promo line from server.
-const char kNTPPromoLine[] = "ntp.promo_line";
-
-// True if user has explicitly closed the promo line.
-const char kNTPPromoClosed[] = "ntp.promo_closed";
-
 const char kDevToolsDisabled[] = "devtools.disabled";
 
 // A boolean specifying whether dev tools window should be opened docked.