Implement a basic Site Engagement Score 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 61a7647298b6126f522b7d3f73c1a25b557bda5d..ed5aecce7933058997a8b1d4014f63893db27316 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -351,6 +351,10 @@ const char kDisableSdchPersistence[] = "disable-sdch-persistence";
 // Disables using bubbles for session restore request.
 const char kDisableSessionCrashedBubble[] = "disable-session-crashed-bubble";
 
+// Disables the Site Engagement service, which records interaction with sites
+// and allocates certain resources accordingly.
+const char kDisableSiteEngagementService[] = "disable-site-engagement-service";
+
 // Disables the suggestions service.
 const char kDisableSuggestionsService[]     = "disable-suggestions-service";
 
@@ -561,6 +565,10 @@ const char kEnableSessionCrashedBubble[] = "enable-session-crashed-bubble";
 const char kEnableSettingsWindow[]           = "enable-settings-window";
 const char kDisableSettingsWindow[]          = "disable-settings-window";
 
+// Enable the Site Engagement service, which records interaction with sites and
+// allocates certain resources accordingly.
+const char kEnableSiteEngagementService[]   = "enable-site-engagement-service";
+
 // Enable SPDY/4, aka HTTP/2. This is a temporary testing flag.
 const char kEnableSpdy4[]                   = "enable-spdy4";