Add UMA histogram data representing the Synced Notifications feature.

chrome/browser/notifications/sync_notifier/chrome_notifier_delegate.cc

 // Copyright (c) 2013 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 "chrome/browser/notifications/sync_notifier/chrome_notifier_delegate.h"
 
+
+#include "base/metrics/histogram.h"
 #include "chrome/browser/notifications/sync_notifier/chrome_notifier_service.h"
 #include "chrome/browser/notifications/sync_notifier/synced_notification.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "content/public/browser/page_navigator.h"
+#include "content/public/browser/user_metrics.h"
 
 namespace notifier {
 ChromeNotifierDelegate::ChromeNotifierDelegate(
     const std::string& notification_id,
     ChromeNotifierService* notifier)
     : notification_id_(notification_id), chrome_notifier_(notifier) {}
 
 ChromeNotifierDelegate::~ChromeNotifierDelegate() {}
 
 std::string ChromeNotifierDelegate::id() const {
    return notification_id_;
 }
 
 content::RenderViewHost* ChromeNotifierDelegate::GetRenderViewHost() const {
     return NULL;
 }
 
+void ChromeNotifierDelegate::CollectAction(SyncedNotificationActionType type) {
+  DCHECK(!notification_id_.empty());
+
+  UMA_HISTOGRAM_ENUMERATION("SyncedNotifications.Actions",
+                            type,
+                            SYNCED_NOTIFICATION_ACTION_COUNT);
+}
+
+
 // TODO(petewil) Add the ability to do URL actions also.
 void ChromeNotifierDelegate::Click() {
   SyncedNotification* notification =
       chrome_notifier_->FindNotificationById(notification_id_);
   if (notification == NULL)
     return;
 
   GURL destination = notification->GetDefaultDestinationUrl();
   NavigateToUrl(destination);
   chrome_notifier_->MarkNotificationAsRead(notification_id_);
+
+  // Record the action in UMA statistics.
+  CollectAction(SYNCED_NOTIFICATION_ACTION_CLICK);
 }
 
 // TODO(petewil) Add the ability to do URL actions also.
 void ChromeNotifierDelegate::ButtonClick(int button_index) {
   SyncedNotification* notification =
       chrome_notifier_->FindNotificationById(notification_id_);
   if (notification) {
     GURL destination = notification->GetButtonUrl(button_index);
     NavigateToUrl(destination);
     chrome_notifier_->MarkNotificationAsRead(notification_id_);
   }
+
+  // Now record the UMA statistics for this action.
+  CollectAction(SYNCED_NOTIFICATION_ACTION_BUTTON_CLICK);
 }
 
 void ChromeNotifierDelegate::NavigateToUrl(const GURL& destination) const {
   if (!destination.is_valid())
     return;
 
   content::OpenURLParams openParams(destination, content::Referrer(),
                                     NEW_FOREGROUND_TAB,
                                     content::PAGE_TRANSITION_LINK, false);
   Browser* browser = chrome::FindLastActiveWithProfile(
       chrome_notifier_->profile(),
       chrome::GetActiveDesktop());
   // Navigate to the URL in a new tab.
   if (browser != NULL)
     browser->OpenURL(openParams);
 
 }
 
 void ChromeNotifierDelegate::Close(bool by_user) {
   if (by_user)
     chrome_notifier_->MarkNotificationAsRead(notification_id_);
+
+  CollectAction(by_user ?
+      SYNCED_NOTIFICATION_ACTION_CLOSE_BY_USER :
+      SYNCED_NOTIFICATION_ACTION_CLOSE_BY_SYSTEM);
 }
 
 }  // namespace notifier