capping how many times background download resumption can automatically start

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.download;
 
 import android.app.DownloadManager;
 import android.content.ActivityNotFoundException;
 import android.content.BroadcastReceiver;
 import android.content.Context;
@@ skipping 299 matching lines @@
         if (!downloadInfo.isResumable()) {
             status = DOWNLOAD_STATUS_FAILED;
         } else if (isAutoResumable) {
             addAutoResumableDownload(item.getId());
         }
         updateDownloadProgress(item, status);
         scheduleUpdateIfNeeded();
     }
 
     /**
+     * Called when browser activity is launched. For background resumption and cancellation, this
+     * will not be called.
+     */
+    public void onActivityLaunched() {
+        DownloadNotificationService.clearResumptionAttemptLeft();
+    }
+
+    /**
      * Clear any pending OMA downloads by reading them from shared prefs.
      * TODO(qinmin): move this to a separate class.
      */
     public void clearPendingOMADownloads() {
         if (mSharedPrefs.contains(PENDING_OMA_DOWNLOADS)) {
             Set<String> omaDownloads = getStoredDownloadInfo(mSharedPrefs, PENDING_OMA_DOWNLOADS);
             for (String omaDownload : omaDownloads) {
                 OMAEntry entry = OMAEntry.parseOMAEntry(omaDownload);
                 clearPendingOMADownload(entry.mDownloadId, entry.mInstallNotifyURI);
             }
@@ skipping 1127 matching lines @@
     public void purgeActiveNetworkList(int[] activeNetIds) {}
 
     private native long nativeInit();
     private native void nativeResumeDownload(
             long nativeDownloadManagerService, String downloadGuid);
     private native void nativeCancelDownload(
             long nativeDownloadManagerService, String downloadGuid, boolean isOffTheRecord,
             boolean isNotificationDismissed);
     private native void nativePauseDownload(long nativeDownloadManagerService, String downloadGuid);
 }