Revert of NTP Zombie Code Slayer Part IV: Most Visited

chrome/browser/ui/webui/ntp/new_tab_page_handler.cc

Index: chrome/browser/ui/webui/ntp/new_tab_page_handler.cc
diff --git a/chrome/browser/ui/webui/ntp/new_tab_page_handler.cc b/chrome/browser/ui/webui/ntp/new_tab_page_handler.cc
index a07e34075898c0fbd1c7cdc8adca66d561239a1f..d908496a065f3ef0aa00ff5d2b9cbd801896eb3f 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_page_handler.cc
+++ b/chrome/browser/ui/webui/ntp/new_tab_page_handler.cc
@@ -67,6 +67,9 @@
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback("pageSelected",
       base::Bind(&NewTabPageHandler::HandlePageSelected,
+                 base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("logTimeToClick",
+      base::Bind(&NewTabPageHandler::HandleLogTimeToClick,
                  base::Unretained(this)));
 }
 
@@ -140,6 +143,26 @@
                             shown_page_type, kHistogramEnumerationMax);
 }
 
+void NewTabPageHandler::HandleLogTimeToClick(const base::ListValue* args) {
+  std::string histogram_name;
+  double duration;
+  if (!args->GetString(0, &histogram_name) || !args->GetDouble(1, &duration)) {
+    NOTREACHED();
+    return;
+  }
+
+  base::TimeDelta delta = base::TimeDelta::FromMilliseconds(duration);
+
+  if (histogram_name == "NewTabPage.TimeToClickMostVisited") {
+    UMA_HISTOGRAM_LONG_TIMES("NewTabPage.TimeToClickMostVisited", delta);
+  } else if (histogram_name == "ExtendedNewTabPage.TimeToClickMostVisited") {
+    UMA_HISTOGRAM_LONG_TIMES(
+        "ExtendedNewTabPage.TimeToClickMostVisited", delta);
+  } else {
+    NOTREACHED();
+  }
+}
+
 // static
 void NewTabPageHandler::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
@@ -150,6 +173,7 @@
 // static
 void NewTabPageHandler::GetLocalizedValues(Profile* profile,
                                            base::DictionaryValue* values) {
+  values->SetInteger("most_visited_page_id", MOST_VISITED_PAGE_ID);
   values->SetInteger("apps_page_id", APPS_PAGE_ID);
 
   PrefService* prefs = profile->GetPrefs();