Add histograms that track how long it takes to open the new tab page.

chrome/browser/dom_ui/new_tab_ui.cc

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "build/build_config.h"
 
 #include "chrome/browser/dom_ui/new_tab_ui.h"
 
 #include <set>
 
@@ skipping 1528 matching lines @@
  public:
   MetricsHandler() {}
   virtual ~MetricsHandler() {}
 
   // DOMMessageHandler implementation.
   virtual void RegisterMessages();
 
   // Callback which records a user action.
   void HandleMetrics(const Value* content);
 
+  // Callback for the "logEventTime" message.
+  void HandleLogEventTime(const Value* content);
+
  private:
 
   DISALLOW_COPY_AND_ASSIGN(MetricsHandler);
 };
 
 void MetricsHandler::RegisterMessages() {
   dom_ui_->RegisterMessageCallback("metrics",
       NewCallback(this, &MetricsHandler::HandleMetrics));
+
+  dom_ui_->RegisterMessageCallback("logEventTime",
+      NewCallback(this, &MetricsHandler::HandleLogEventTime));
 }
 
 void MetricsHandler::HandleMetrics(const Value* content) {
   if (content && content->GetType() == Value::TYPE_LIST) {
     const ListValue* list_value = static_cast<const ListValue*>(content);
     Value* list_member;
     if (list_value->Get(0, &list_member) &&
         list_member->GetType() == Value::TYPE_STRING) {
       const StringValue* string_value =
           static_cast<const StringValue*>(list_member);
       std::wstring wstring_value;
       if (string_value->GetAsString(&wstring_value)) {
         UserMetrics::RecordComputedAction(wstring_value, dom_ui_->GetProfile());
       }
     }
   }
 }
 
+void MetricsHandler::HandleLogEventTime(const Value* content) {
+  if (content && content->GetType() == Value::TYPE_LIST) {
+    const ListValue* list_value = static_cast<const ListValue*>(content);
+    Value* list_member;
+    if (list_value->Get(0, &list_member) &&
+        list_member->GetType() == Value::TYPE_STRING) {
+      std::string event_name;
+      if (list_member->GetAsString(&event_name)) {
+        dom_ui_->tab_contents()->LogNewTabTime(event_name);
+      }
+    }
+  }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // NewTabPageSetHomepageHandler
 
 // Sets the new tab page as homepage when user clicks on "make this my homepage"
 // link.
 class NewTabPageSetHomepageHandler : public DOMMessageHandler {
  public:
   NewTabPageSetHomepageHandler() {}
   virtual ~NewTabPageSetHomepageHandler() {}
 
@@ skipping 162 matching lines @@
 bool NewTabUI::WebResourcesEnabled() {
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   return !command_line->HasSwitch(switches::kDisableWebResources);
 }
 
 // static
 bool NewTabUI::FirstRunDisabled() {
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   return command_line->HasSwitch(switches::kDisableNewTabFirstRun);
 }