NTP: Record TileType metrics also on desktop

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 93d11fe595e55d2da3c2b24cadc283f6313be500..921d17bbbbad9d4cb2bd0c841102a6deddb25f1c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -42405,19 +42405,19 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="NewTabPage.TileType" enum="NTPTileVisualType">
-  <owner>newt@chromium.org</owner>
+  <owner>mastiz@chromium.org</owner>

[Marc Treib, 2017/04/06 09:35:35]

newt@ doesn't work on Chromium anymore. mastiz@ is currently the main person
looking at these metrics.

   <summary>
     The visual type of each most visited tile displayed on the new tab page,
     e.g. actual thumbnail or placeholder thumbnail. This is recorded for each
-    most visited item when the NTP is opened. Only measured on Android.
+    most visited item when the NTP is opened.
   </summary>
 </histogram>
 
 <histogram name="NewTabPage.TileTypeClicked" enum="NTPTileVisualType">
-  <owner>newt@chromium.org</owner>
+  <owner>mastiz@chromium.org</owner>
   <summary>
     The visual type of the most visited item that the user clicked on, e.g.
-    actual thumbnail or placeholder thumbnail. Only measured on Android.
+    actual thumbnail or placeholder thumbnail.
   </summary>
 </histogram>
 
@@ -104559,6 +104559,12 @@ from previous Chrome versions.
   <int value="6" label="DeprecatedThumbnailDefault">
     Deprecated: The item displays a default graphic in place of a thumbnail.
   </int>
+  <int value="7" label="Thumbnail">
+    The item displays a thumbnail of the page.
+  </int>
+  <int value="8" label="ThumbnailFailed">
+    The item displays a default gray box in place of a thumbnail.
+  </int>
 </enum>
 
 <enum name="NTSTATUS" type="int">