Add metrics to measure time elapsed between form load and form submission with or without Autofill.

chrome/browser/autofill/autofill_metrics.cc

Index: chrome/browser/autofill/autofill_metrics.cc
diff --git a/chrome/browser/autofill/autofill_metrics.cc b/chrome/browser/autofill/autofill_metrics.cc
index 593f44963717779051ce2bf4404d39d1f98546ce..3a215623bbfbc979c0a5d448353237d085ae7f3a 100644
--- a/chrome/browser/autofill/autofill_metrics.cc
+++ b/chrome/browser/autofill/autofill_metrics.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
+#include "base/time.h"
 #include "chrome/browser/autofill/autofill_type.h"
 #include "chrome/browser/autofill/form_structure.h"
 #include "webkit/glue/form_data.h"
@@ -295,6 +296,16 @@ void AutofillMetrics::LogUserHappinessMetric(UserHappinessMetric metric) const {
                             NUM_USER_HAPPINESS_METRICS);
 }
 
+void AutofillMetrics::LogAutofilledFormSubmittedAfterDuration(
+    const base::TimeDelta& duration) const {
+  UMA_HISTOGRAM_TIMES("Autofill.FormFillTime.WithAutofill", duration);
+}
+
+void AutofillMetrics::LogNonAutofilledFormSubmittedAfterDuration(
+    const base::TimeDelta& duration) const {
+  UMA_HISTOGRAM_TIMES("Autofill.FormFillTime.WithoutAutofill", duration);
+}
+
 void AutofillMetrics::LogIsAutofillEnabledAtStartup(bool enabled) const {
   UMA_HISTOGRAM_BOOLEAN("Autofill.IsEnabled.Startup", enabled);
 }