Metrics for feature engagement tracker.

tools/metrics/histograms/enums.xml

Index: tools/metrics/histograms/enums.xml
diff --git a/tools/metrics/histograms/enums.xml b/tools/metrics/histograms/enums.xml
index 0187308a80b601a5d305b51011af7093c9f1fc79..d77c1f6dea4c1f860de7b78c967eaf8b9f15f31f 100644
--- a/tools/metrics/histograms/enums.xml
+++ b/tools/metrics/histograms/enums.xml
@@ -4954,6 +4954,20 @@ uploading your change for review.  These are checked by presubmit scripts.
   <int value="5" label="Try to override the status when its valus is error."/>
 </enum>
 
+<enum name="ConfigParsingEvent" type="int">
+  <int value="0" label="SUCCESS"/>
+  <int value="1" label="FAILURE"/>
+  <int value="2" label="FAILURE_NO_FIELD_TRIAL"/>
+  <int value="3" label="FAILURE_USED_EVENT_PARSE"/>
+  <int value="4" label="FAILURE_USED_EVENT_MISSING"/>
+  <int value="5" label="FAILURE_TRIGGER_EVENT_PARSE"/>
+  <int value="6" label="FAILURE_TRIGGER_EVENT_MISSING"/>
+  <int value="7" label="FAILURE_OTHER_EVENT_PARSE"/>
+  <int value="8" label="FAILURE_SESSION_RATE_PARSE"/>
+  <int value="9" label="FAILURE_AVAILABILITY_PARSE"/>
+  <int value="10" label="FAILURE_UNKNOWN_KEY"/>
+</enum>
+
 <enum name="ConnectionDiagnosticsIssue" type="int">
   <int value="0" label="IP collision detected."/>
   <int value="1" label="Routing problem detected."/>
@@ -35686,6 +35700,21 @@ from previous Chrome versions.
   <int value="2" label="unexpected other schemes"/>
 </enum>
 
+<enum name="TriggerHelpUIResult" type="int">
+  <int value="0" label="SUCCESS"/>
+  <int value="1" label="FAILURE"/>
+  <int value="2" label="FAILURE_MODEL_NOT_READY"/>
+  <int value="3" label="FAILURE_CURRENTLY_SHOWING"/>
+  <int value="4" label="FAILURE_FEATURE_DISABLED"/>
+  <int value="5" label="FAILURE_CONFIG_INVALID"/>
+  <int value="6" label="FAILURE_USED_PRECONDITION_UNMET"/>
+  <int value="7" label="FAILURE_TRIGGER_PRECONDITION_UNMET"/>
+  <int value="8" label="FAILURE_OTHER_PRECONDITION_UNMET"/>
+  <int value="9" label="FAILURE_SESSION_RATE"/>
+  <int value="10" label="FAILURE_AVAILABILITY_MODEL_NOT_READY"/>
+  <int value="11" label="FAILURE_AVAILABILITY_PRECONDITION_UNMET"/>
+</enum>
+
 <enum name="TrimMemoryLevel" type="int">
   <summary>
     The level provided by Android's ComponentCallbacks2.onTrimMemory().