[Download Home] Various fixes

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
index 673b75ddd3e3fa9a8e69edd11ec248652df1a11f..24fdbe65a8ac3cd646b19a6d85c1b3404cebb3dd 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
@@ -4,6 +4,7 @@
 
 package org.chromium.chrome.browser.download;
 
+import android.app.Activity;
 import android.app.DownloadManager;
 import android.content.ActivityNotFoundException;
 import android.content.BroadcastReceiver;
@@ -21,6 +22,8 @@ import android.text.TextUtils;
 import android.util.LongSparseArray;
 import android.util.Pair;
 
+import org.chromium.base.ActivityState;
+import org.chromium.base.ApplicationStatus;
 import org.chromium.base.ContextUtils;
 import org.chromium.base.Log;
 import org.chromium.base.ObserverList;
@@ -30,6 +33,8 @@ import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.SuppressFBWarnings;
 import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.chrome.R;
+import org.chromium.chrome.browser.ChromeActivity;
+import org.chromium.chrome.browser.ChromeFeatureList;
 import org.chromium.chrome.browser.download.ui.BackendProvider;
 import org.chromium.chrome.browser.download.ui.DownloadHistoryAdapter;
 import org.chromium.chrome.browser.externalnav.ExternalNavigationDelegateImpl;
@@ -1069,6 +1074,21 @@ public class DownloadManagerService extends BroadcastReceiver implements
      * @param context Application context
      */
     protected static void openDownloadsPage(Context context) {
+        if (!ChromeFeatureList.isEnabled(ChromeFeatureList.SYSTEM_DOWNLOAD_MANAGER)) {
+            // Try to open Download Home.
+            Activity lastActivity = ApplicationStatus.getLastTrackedFocusedActivity();
+            if (lastActivity instanceof ChromeActivity) {
+                int state = ApplicationStatus.getStateForActivity(lastActivity);
+                if (state >= ActivityState.CREATED && state <= ActivityState.RESUMED) {
+                    ChromeActivity chromeActivity = (ChromeActivity) lastActivity;
+                    DownloadUtils.showDownloadManager(
+                            lastActivity, chromeActivity.getActivityTab());
+                    return;
+                }
+            }
+        }
+
+        // Open the Android Download Manager.
         Intent pageView = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
         pageView.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         try {