Log some information about the state of the homepage on Android.

chrome/browser/prefs/pref_metrics_service.h

Index: chrome/browser/prefs/pref_metrics_service.h
diff --git a/chrome/browser/prefs/pref_metrics_service.h b/chrome/browser/prefs/pref_metrics_service.h
index 7627e48b4d2f1f8418afe2f7868fd46a7d6860b4..c2910e59fdf6bcab820b73e656b6e03e9a0ddc41 100644
--- a/chrome/browser/prefs/pref_metrics_service.h
+++ b/chrome/browser/prefs/pref_metrics_service.h
@@ -25,6 +25,18 @@ class PrefMetricsService : public KeyedService {
   explicit PrefMetricsService(Profile* profile);
   ~PrefMetricsService() override;
 
+  // Records metrics about the state of the homepage on launch.  On all
+  // platforms except Android this will be triggered automatically as part of
+  // initializing the PrefMetricsService.
+  //
+  // On Android, determining whether the homepage is enabled requires waiting
+  // for a response from a third party provider installed on the device.  Thus,
+  // this functionality is exposed to  allow it to be called once all the

[Mark P, 2016/05/24 19:07:17]

nit: extra space

[Ted C, 2016/05/24 19:55:53]

Done.

+  // necessary information is available.
+  static void RecordHomePageLaunchMetrics(bool show_home_button,
+                                          bool homepage_is_ntp,
+                                          const GURL& homepage_url);
+
   class Factory : public BrowserContextKeyedServiceFactory {
    public:
     static Factory* GetInstance();