[Autofill] Log the number of autofill profiles available at form submission

components/autofill/core/browser/autofill_metrics.cc

Index: components/autofill/core/browser/autofill_metrics.cc
diff --git a/components/autofill/core/browser/autofill_metrics.cc b/components/autofill/core/browser/autofill_metrics.cc
index 21ca9f840d9ecad5624ba2474946b25d9dea0de2..13f0b75424132f220cd06a857a049bbbf1bafc84 100644
--- a/components/autofill/core/browser/autofill_metrics.cc
+++ b/components/autofill/core/browser/autofill_metrics.cc
@@ -460,6 +460,11 @@ void AutofillMetrics::LogStoredProfileCount(size_t num_profiles) {
   UMA_HISTOGRAM_COUNTS("Autofill.StoredProfileCount", num_profiles);
 }
 
+//static
+void AutofillMetrics::LogNumberOfProfilesAtFormSubmission(size_t num_profiles) {
+  UMA_HISTOGRAM_COUNTS("Autofill.StoredProfileCountAtSubmission", num_profiles);

[Ilya Sherman, 2015/01/28 23:17:57]

nit: I'd make the name a little bit more explicit, i.e. instead of
"AtSubmission" I'd write "AtAutofillableFormSubmission", or something like that.

+}
+
 // static
 void AutofillMetrics::LogAddressSuggestionsCount(size_t num_suggestions) {
   UMA_HISTOGRAM_COUNTS("Autofill.AddressSuggestionsCount", num_suggestions);