Record domains where Reader Mode is opened for too short

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java
index cedcb0870288cc0a76c922edd374b2bcfb7956f1..6cac3105dcf84486bc8a6b379f9032cbdc55a471 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java
@@ -31,6 +31,8 @@ import org.chromium.ui.resources.ResourceManager;
  * The panel containing reader mode.
  */
 public class ReaderModePanel extends OverlayPanel {
+    /** If the user only opens the panel for less than 2 seconds, it is considered unhelpful. */
+    private static final int SHORT_TIME_FOR_RECORD = 2000;
 
     /** The compositor layer used for drawing the panel. */
     private ReaderModeSceneLayer mSceneLayer;
@@ -287,6 +289,12 @@ public class ReaderModePanel extends OverlayPanel {
         long totalTime = System.currentTimeMillis() - mStartTime;
         if (mStartTime <= 0 || totalTime < 0) return;
         mManagerDelegate.recordTimeSpentInReader(totalTime);
+
+        if (totalTime < SHORT_TIME_FOR_RECORD) {
+            String url = mManagerDelegate.getBasePageWebContents().getUrl();
+            RapporServiceBridge.sampleDomainAndRegistryFromURL(
+                    "DomDistiller.OpenPanelShortTime", url);
+        }
     }
 
     @Override