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 0ddcae19396575e7b5a390ae8b371661786dd299..fe6b9416f21432ecac94a47a93be37ff4682a1cf 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -342,6 +342,10 @@ 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";
 
@@ -552,6 +556,10 @@ 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";