[Password Manager] Add UMA stats to track interaction with synced accounts.

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 0ad0c762ca2967dba1ed48ba5bbafdfb67265daa..8642edc86a3fbd33f2fdc10706be3478e0923974 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -9560,6 +9560,15 @@ should be able to be added at any place in this file.
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="PasswordManager_SyncCredentialShown">
+  <owner>gcasto@chromium.org</owner>
+  <owner>vabr@chromium.org</owner>
+  <description>
+    Counts the number of times a user views the saved credentials for their sync
+    account.
+  </description>
+</action>
+
 <action name="Paste">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>