tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index df5dbbca25f4e8a4e22639aef070f7db1411c1b4..9ba6ea3a89357bac738d73b5e19c789c21654b35 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -22133,7 +22133,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Records the source that requested showing the feedback app.</summary>
 </histogram>
 
-<histogram name="FileBrowser.ChangeDirectory.RootType" enum="FileManagerRootType">
+<histogram name="FileBrowser.ChangeDirectory.RootType"
+    enum="FileManagerRootType">
   <owner>yamaguchi@chromium.com</owner>
   <summary>
     Chrome OS File Browser: Counts the number of directory-changed events,
@@ -87221,6 +87222,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>The type of category clicked in the Windows Jumplist</summary>
 </histogram>
 
+<histogram name="WinJumplist.AddCategoryTimeComparison">

[Ilya Sherman, 2017/07/04 03:41:19]

Please add a units attribute, even if it's just something like units="scaled
ratio".

[chengx, 2017/07/04 06:02:16]

Done.

+  <owner>chengx@chromium.org</owner>
+  <summary>
+    How many times (multiplied by 10) the time cost of adding most-visited
+    category is that of adding recently-closed category.

[Ilya Sherman, 2017/07/04 03:41:19]

Optional nit: Perhaps: "The ratio of the duration spent adding the most-visited
category compared to the duration spent adding the recently-closed category,
multiplied by 10."

[chengx, 2017/07/04 06:02:16]

Much more clear. Thanks!

+  </summary>
+</histogram>
+
 <histogram name="WinJumplist.CreateIconFilesCount">
   <owner>chengx@chromium.org</owner>
   <summary>