[Payments] Use event to log checkout funnel metrics.

components/payments/core/journey_logger.cc

Index: components/payments/core/journey_logger.cc
diff --git a/components/payments/core/journey_logger.cc b/components/payments/core/journey_logger.cc
index aeae9aa0652bf7083c6e76c8c5f482a4c06a61d4..953e307dd2d572357c16eb0c691bc31fc18ab000 100644
--- a/components/payments/core/journey_logger.cc
+++ b/components/payments/core/journey_logger.cc
@@ -116,6 +116,8 @@ void JourneyLogger::RecordJourneyStatsHistograms(
   DCHECK(!has_recorded_);
   has_recorded_ = true;
 
+  RecordCheckoutFlowMetrics();
+
   RecordSectionSpecificStats(completion_status);
 
   // Record the CanMakePayment metrics based on whether the transaction was
@@ -125,6 +127,23 @@ void JourneyLogger::RecordJourneyStatsHistograms(
   RecordUrlKeyedMetrics(completion_status);
 }
 
+void JourneyLogger::RecordCheckoutFlowMetrics() {
+  UMA_HISTOGRAM_BOOLEAN("PaymentRequest.CheckoutFunnel.Initiated", true);
+
+  if (events_ & EVENT_SHOWN)
+    UMA_HISTOGRAM_BOOLEAN("PaymentRequest.CheckoutFunnel.Shown", true);
+
+  if (events_ & EVENT_PAY_CLICKED)
+    UMA_HISTOGRAM_BOOLEAN("PaymentRequest.CheckoutFunnel.PayClicked", true);
+
+  if (events_ & EVENT_RECEIVED_INSTRUMENT_DETAILS)
+    UMA_HISTOGRAM_BOOLEAN(
+        "PaymentRequest.CheckoutFunnel.ReceivedInstrumentDetails", true);
+
+  if (events_ & EVENT_SKIPPED_SHOW)
+    UMA_HISTOGRAM_BOOLEAN("PaymentRequest.CheckoutFunnel.SkippedShow", true);
+}
+
 void JourneyLogger::RecordSectionSpecificStats(
     CompletionStatus completion_status) {
   // Record whether the user had suggestions for each requested information.