[TTS] Write initial Tap-features to Ranker.

tools/metrics/ukm/ukm.xml

 <!--
 Copyright 2017 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <!--
 This file is used to generate a comprehensive list of Chrome UKM metrics
 along with a detailed description for each metric.
 
@@ skipping 141 matching lines @@
     </summary>
   </metric>
   <metric name="ServerType">
     <summary>
       Field's |ServerFieldType| returned by server. See
       |AutofillField.server_type()|.
     </summary>
   </metric>
 </event>
 
+<event name="ContextualSearch">
+  <owner>donnd@chromium.org</owner>
+  <summary>
+    Metrics related to a Contextual Search Tap event on a page, for use with
+    Ranker.  These metrics are recorded each time the user triggers the
+    Contextual Search UI via a tap gesture (when enabled).
+  </summary>
+  <metric name="DURATION_AFTER_SCROLL_MS">
+    <summary>
+      Duration in MS between showing the UI and a subsequent scroll event, or
+      not recorded if there was no subsequent scroll.
+    </summary>
+  </metric>
+  <metric name="DURATION_BEFORE_SCROLL_MS">

[Donn Denman, 2017/05/19 15:06:01]

One quick comment -- these upper-case names seem very ugly to me, but we can
update them in a subsequent CL.  I plan to make several additions and some
changes so this can be done soon.  In fact I plan on removing this specific
feature since it's not actionable by Ranker.

+    <summary>
+      Duration in MS between showing the most recent scroll event and showing
+      the UI, or 0 if no previous scroll event occurred.
+    </summary>
+  </metric>
+  <metric name="OUTCOME_WAS_PANEL_OPENED">
+    <summary>
+      Whether the user opened the overlay panel.  This is the primary outcome
+      metric.
+    </summary>
+  </metric>
+  <metric name="OUTCOME_WAS_QUICK_ACTION_CLICKED">
+    <summary>
+      Whether the user clicked within the overlay panel when a Quick-Action was
+      shown.  This is a secondary outcome metric.
+    </summary>
+  </metric>
+  <metric name="OUTCOME_WAS_QUICK_ANSWER_SEEN">
+    <summary>
+      Whether the user could see a Quick-Answer caption within the overlay
+      panel.  This is a tertiary outcome metric.
+    </summary>
+  </metric>
+  <metric name="PREVIOUS_28DAY_CTR_PERCENT">
+    <summary>
+      The CTR of the overlay panel for this user, aggregated over a previous 28
+      day period, expressed as an integer between 0-99.
+    </summary>
+  </metric>
+  <metric name="PREVIOUS_28DAY_IMPRESSIONS_COUNT">
+    <summary>
+      The count of views of the overlay panel for this user, aggregated over a
+      previous 28 day period.
+    </summary>
+  </metric>
+  <metric name="PREVIOUS_WEEK_CTR_PERCENT">
+    <summary>
+      The CTR of the overlay panel for this user, aggregated over the previous
+      week, expressed as an integer between 0-99.
+    </summary>
+  </metric>
+  <metric name="PREVIOUS_WEEK_IMPRESSIONS_COUNT">
+    <summary>
+      The count of views of the overlay panel for this user, aggregated over the
+      previous week.
+    </summary>
+  </metric>
+  <metric name="SCREEN_TOP_DPS">
+    <summary>
+      The location of the tap relative to the top of the screen, expressed in
+      DPs.
+    </summary>
+  </metric>
+  <metric name="WAS_SCREEN_BOTTOM">
+    <summary>
+      The location of the tap relative to the bottom of the screen, expressed as
+      an integer with 0 meaning not at the bottom and 1 meaning at the bottom.
+    </summary>
+  </metric>
+</event>
+
 <event name="PageLoad" singular="True">
   <owner>bmcquade@chromium.org</owner>
   <summary>
     Recorded when Pageload observer events fire.
   </summary>
   <metric name="DocumentTiming.NavigationToDOMContentLoadedEventFired">
     <summary>
       Time from navigation to dom content loaded in ms.
     </summary>
   </metric>
@@ skipping 47 matching lines @@
   <metric name="DeclineCount"/>
   <metric name="EventType"/>
   <metric name="IgnoreCount"/>
   <metric name="RankerResponse"/>
   <metric name="RankerVersion"/>
   <metric name="SourceLanguage"/>
   <metric name="TargetLanguage"/>
 </event>
 
 </ukm-configuration>