Quick View UMA: export how quick view was opened.

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 b90075d549b9ace8857f9c9f909c81c0001b6eef..de1e848126bff496f150c383549c7631755efb93 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -18742,6 +18742,12 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>The volume type where quick view is opened.</summary>
 </histogram>
 
+<histogram name="FileBrowser.QuickView.WayToOpen"
+    enum="FileManagerQuickViewWayToOpen">
+  <owner>oka@google.com</owner>
+  <summary>How quick view was opened.</summary>
+</histogram>
+
 <histogram name="FileBrowser.SuggestApps.Close"
     enum="SuggestAppsDialogCloseReason">
   <owner>joshwoodward@google.com</owner>
@@ -88586,6 +88592,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="6" label="Error"/>
 </enum>
 
+<enum name="FileManagerQuickViewWayToOpen" type="int">
+  <int value="0" label="Context menu"/>
+  <int value="1" label="Space key"/>
+</enum>
+
 <enum name="FileManagerVolumeType" type="int">
   <int value="0" label="Google Drive"/>
   <int value="1" label="Download Folder"/>