[Download home] Record user action when user opens a download

BUG=718960

Review-Url: https://codereview.chromium.org/2880123002
Cr-Commit-Position: refs/heads/master@{#472208}

chrome/android/java/src/org/chromium/chrome/browser/download/ui/DownloadHistoryItemWrapper.java

@@ -10,6 +10,7 @@ import android.text.TextUtils;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.metrics.RecordHistogram;
+import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.download.DownloadInfo;
 import org.chromium.chrome.browser.download.DownloadItem;
@@ -189,6 +190,7 @@ public abstract class DownloadHistoryItemWrapper extends TimedItem {
     abstract boolean remove();
 
     protected void recordOpenSuccess() {
+        RecordUserAction.record("Android.DownloadManager.Item.OpenSucceeded");
         RecordHistogram.recordEnumeratedHistogram("Android.DownloadManager.Item.OpenSucceeded",
                 getFilterType(), DownloadFilter.FILTER_BOUNDARY);
 

tools/metrics/actions/actions.xml

@@ -1283,6 +1283,11 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="Android.DownloadManager.Item.OpenSucceeded">
+  <owner>shaktisahu@chromium.org</owner>
+  <description>User opened a download from download home.</description>
+</action>
+
 <action name="Android.DownloadManager.OpenDrawer">
   <owner>dfalcantara@chromium.org</owner>
   <owner>twellington@chromium.org</owner>