[Payments] Only record abort metrics if the Payment Request was shown.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index db0258319ce14ea934ea95de8bf9efb534e836ed..fde39ae3aa03cf00ce8490f7b196efa141cf41a2 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -45736,6 +45736,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>When a Payment Request gets initiated by the user.</summary>
 </histogram>
 
+<histogram name="PaymentRequest.CheckoutFunnel.NoShow"
+    enum="PaymentRequestNoShowReason">
+  <owner>sebsg@chromium.org</owner>
+  <summary>
+    The reason that lead to the Payment Request not being shown to the user.

[please use gerrit instead, 2017/02/06 22:42:14]

leads

[sebsg, 2017/02/06 22:48:03]

Done.

+  </summary>
+</histogram>
+
 <histogram name="PaymentRequest.CheckoutFunnel.PayClicked" enum="BooleanHit">
   <owner>sebsg@chromium.org</owner>
   <summary>
@@ -101577,8 +101585,8 @@ value.
   <int value="3" label="MojoConnectionError"/>
   <int value="4" label="MojoRendererClosing"/>
   <int value="5" label="InstrumentDetailsError"/>
-  <int value="6" label="NoMatchingPaymentMethod"/>
-  <int value="7" label="NoSupportedPaymentMethod"/>
+  <int value="6" label="Deprecated"/>
+  <int value="7" label="Deprecated"/>
   <int value="8" label="Other"/>
 </enum>
 
@@ -101596,6 +101604,11 @@ value.
   <int value="1" label="Aborted"/>
 </enum>
 
+<enum name="PaymentRequestNoShowReason" type="int">
+  <int value="0" label="NoMatchingPaymentMethod"/>
+  <int value="1" label="NoSupportedPaymentMethod"/>
+</enum>
+
 <enum name="PaymentRequestPaymentMethods" type="int">
   <int value="0" label="Autofill credit cards"/>
   <int value="1" label="Android Pay"/>