Add UMA for signin through NTP content suggestions.

tools/metrics/actions/actions.xml

Index: tools/metrics/actions/actions.xml
diff --git a/tools/metrics/actions/actions.xml b/tools/metrics/actions/actions.xml
index f900f254f2ecfc9b27d57f15e02a792545a76ed0..71079820c32765f9b61adfd7d7e1afda7bf1e595 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -13626,6 +13626,13 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="Signin_Impression_FromNTPContentSuggestions">
+  <owner>gogerald@chromium.org</owner>
+  <description>
+    Recorded when showing sign in card in the snippets new tab page.
+  </description>
+</action>
+
 <action name="Signin_Impression_FromPasswordBubble">
   <owner>gogerald@chromium.org</owner>
   <description>
@@ -13790,6 +13797,14 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="Signin_Signin_FromNTPContentSuggestions">
+  <owner>gogerald@chromium.org</owner>
+  <description>
+    Recorded on sign in start from access point
+    signin_metrics::AccessPoint::ACCESS_POINT_NTP_CONTENT_SUGGESTIONS.
+  </description>
+</action>
+
 <action name="Signin_Signin_FromPasswordBubble">
   <owner>gogerald@chromium.org</owner>
   <description>