Removing Scroll user actions because they are extremely spammy.

tools/metrics/actions/actions.xml

 <!--
 Copyright 2014 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 a comprehensive list of Chrome user actions along with the owner
 and description for each user action.
 
@@ skipping 15639 matching lines @@
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="Touchpad_Gesture_Overview">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="TouchscreenScroll">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
+  <owner>tdresser@chromium.org</owner>
+  <description>
+    Logged at the beginning of touchscreen based scrolling. In M56 and earlier,
+    was logged at begin, update, and end events for touchscreen scrolling.
+  </description>
 </action>
 
 <action name="TouchscreenScrollFling">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
+  <owner>tdresser@chromium.org</owner>
+  <description>Logged on an ET_SCROLL_FLING_START gesture event.</description>
 </action>
 
 <action name="Touchscreen_Down">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="Touchview_Disabled">
   <owner>bruthig@chromium.org</owner>
   <owner>tdanderson@chromium.org</owner>
   <description>Recorded when a user exits TouchView mode.</description>
 </action>
 
 <action name="Touchview_Enabled">
   <owner>bruthig@chromium.org</owner>
   <owner>tdanderson@chromium.org</owner>
   <description>Recorded when a user enters TouchView mode.</description>
 </action>
 
 <action name="Touchview_Initially_Disabled">
   <owner>bruthig@chromium.org</owner>
   <owner>tdanderson@chromium.org</owner>
   <description>
     Recorded when the Touchview controller is initialized such that TouchView
     mode is disabled initially.
   </description>
 </action>
 
 <action name="TrackpadScroll">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
+  <owner>tdresser@chromium.org</owner>
+  <description>
+    Logged on trackpad scroll events. Logging was removed in M57, because it
+    caused too many events.
+  </description>
 </action>
 
 <action name="TrackpadScrollFling">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
+  <owner>tdresser@chromium.org</owner>
+  <description>Logged on an ET_SCROLL_FLING_START scroll event.</description>
 </action>
 
 <action name="Transpose">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="Tray_Help">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
@@ skipping 633 matching lines @@
 <action name="webapps.AddShortcut.Manifest">
   <owner>mlamouri@chromium.org</owner>
   <description>
     Shortcut added to the homescreen with a valid Manifest. This action will be
     recorded in addition to AppShortcut, AppShortcutApple and Bookmark actions
     to keep a trend of whether the webapp also add meta tags.
   </description>
 </action>
 
 </actions>