[Suggestions] Add a flag for the Suggestions Service.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 87168e762ef67b662c748ec2ce9e56f6ccf2db8c..39c280585c9a2ae8dfef698f57fcacbf61613245 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -373,6 +373,9 @@ const char kDisableSearchButtonInOmnibox[]  =
 // Disable SPDY/3.1. This is a temporary testing flag.
 const char kDisableSpdy31[]                 = "disable-spdy31";
 
+// Disables the suggestions service.
+const char kDisableSuggestionsService[]     = "disable-suggestions-service";
+
 // Disables syncing browser data to a Google Account.
 const char kDisableSync[]                   = "disable-sync";
 
@@ -640,6 +643,9 @@ const char kEnableStackedTabStrip[]         = "enable-stacked-tab-strip";
 // Enables an experimental hosted app experience.
 const char kEnableStreamlinedHostedApps[]   = "enable-streamlined-hosted-apps";
 
+// Enables the suggestions service.
+const char kEnableSuggestionsService[]      = "enable-suggestions-service";
+
 // Enables synced notifications.
 const char kEnableSyncSyncedNotifications[] =
     "enable-sync-synced-notifications";