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

chrome/browser/prefs/pref_metrics_service.cc

Index: chrome/browser/prefs/pref_metrics_service.cc
diff --git a/chrome/browser/prefs/pref_metrics_service.cc b/chrome/browser/prefs/pref_metrics_service.cc
index 54ee8505c59947eac378c7a6405f4ee6d2532bc2..5de7d9ee56aca114ca91ed016dc3428dfc208de0 100644
--- a/chrome/browser/prefs/pref_metrics_service.cc
+++ b/chrome/browser/prefs/pref_metrics_service.cc
@@ -78,13 +78,14 @@ PrefMetricsService::PrefMetricsService(Profile* profile,
 PrefMetricsService::~PrefMetricsService() {
 }
 
-void PrefMetricsService::RecordLaunchPrefs() {
-  bool show_home_button = prefs_->GetBoolean(prefs::kShowHomeButton);
-  bool home_page_is_ntp = prefs_->GetBoolean(prefs::kHomePageIsNewTabPage);
+// static
+void PrefMetricsService::RecordHomePageLaunchMetrics(bool show_home_button,
+                                                     bool homepage_is_ntp,
+                                                     const GURL& homepage_url) {
   UMA_HISTOGRAM_BOOLEAN("Settings.ShowHomeButton", show_home_button);
   if (show_home_button) {
     UMA_HISTOGRAM_BOOLEAN("Settings.GivenShowHomeButton_HomePageIsNewTabPage",
-                          home_page_is_ntp);
+                          homepage_is_ntp);
   }
 
   // For non-NTP homepages, see if the URL comes from the same TLD+1 as a known
@@ -94,8 +95,7 @@ void PrefMetricsService::RecordLaunchPrefs() {
   // (pages that share a TLD+1 with a known engine but aren't actually search
   // pages, e.g. plus.google.com).  Additionally, record the TLD+1 of non-NTP
   // homepages through the privacy-preserving Rappor service.
-  if (!home_page_is_ntp) {
-    GURL homepage_url(prefs_->GetString(prefs::kHomePage));
+  if (!homepage_is_ntp) {
     if (homepage_url.is_valid()) {
       UMA_HISTOGRAM_ENUMERATION(
           "Settings.HomePageEngineType",
@@ -106,9 +106,27 @@ void PrefMetricsService::RecordLaunchPrefs() {
           homepage_url);
     }
   }
+}
 
+void PrefMetricsService::RecordLaunchPrefs() {
+  // On Android, determining whether the homepage is enabled requires waiting
+  // for a response from a third party provider installed on the device.  So,
+  // it will be logged later once all the dependent information is available.

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

nit: point readers to the call site for this other call.

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

Done

+#if !defined(OS_ANDROID)
+  GURL homepage_url(prefs_->GetString(prefs::kHomePage));
+  RecordHomePageLaunchMetrics(prefs_->GetBoolean(prefs::kShowHomeButton),
+                              prefs_->GetBoolean(prefs::kHomePageIsNewTabPage),
+                              homepage_url);
+#endif
+
+  // Android does not support overriding the NTP URL.
+#if !defined(OS_ANDROID)
   SampleNewTabPageURL(profile_);
+#endif
 
+  // Tab restoring is always done on Android, so these metrics are not
+  // applicable.  Also, startup pages are not supported on Android
+#if !defined(OS_ANDROID)
   int restore_on_startup = prefs_->GetInteger(prefs::kRestoreOnStartup);
   UMA_HISTOGRAM_ENUMERATION("Settings.StartupPageLoadSettings",
                             restore_on_startup, kSessionStartupPrefValueMax);
@@ -136,7 +154,9 @@ void PrefMetricsService::RecordLaunchPrefs() {
       }
     }
   }
+#endif
 
+  // Android does not support pinned tabs.
 #if !defined(OS_ANDROID)
   StartupTabs startup_tabs = PinnedTabCodec::ReadPinnedTabs(profile_);
   UMA_HISTOGRAM_CUSTOM_COUNTS("Settings.PinnedTabs",