Allow InProgressDownloadManager to resume download

This CL allows InProgressDownloadManager to take a URLLoaderFactoryGetter,
and resume the download by itself.

BUG=842245

Change-Id: Ie2e6dff715455ee8449be05d49c43144de8d25c8
Reviewed-on: https://chromium-review.googlesource.com/1102885Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568729}

components/download/internal/common/in_progress_download_manager.cc

@@ -314,7 +314,13 @@ void InProgressDownloadManager::DetermineDownloadTarget(
 
 void InProgressDownloadManager::ResumeInterruptedDownload(
     std::unique_ptr<DownloadUrlParameters> params,
-    const GURL& site_url) {}
+    const GURL& site_url) {
+  if (!url_loader_factory_getter_)
+    return;
+
+  BeginDownload(std::move(params), url_loader_factory_getter_, false, site_url,
+                GURL(), GURL());
+}
 
 base::Optional<DownloadEntry> InProgressDownloadManager::GetInProgressEntry(
     DownloadItemImpl* download) {

components/download/public/common/in_progress_download_manager.h

@@ -128,6 +128,11 @@ class COMPONENTS_DOWNLOAD_EXPORT InProgressDownloadManager
   }
   DownloadFileFactory* file_factory() { return file_factory_.get(); }
 
+  void set_url_loader_factory_getter(
+      scoped_refptr<DownloadURLLoaderFactoryGetter> url_loader_factory_getter) {
+    url_loader_factory_getter_ = std::move(url_loader_factory_getter);
+  }
+
  private:
   // UrlDownloadHandler::Delegate implementations.
   void OnUrlDownloadStarted(
@@ -179,6 +184,10 @@ class COMPONENTS_DOWNLOAD_EXPORT InProgressDownloadManager
   // is managing all downloads.
   std::vector<std::unique_ptr<DownloadItemImpl>> in_progress_downloads_;
 
+  // URLLoaderFactoryGetter for issuing network request when DownloadMangerImpl
+  // is not available.
+  scoped_refptr<DownloadURLLoaderFactoryGetter> url_loader_factory_getter_;
+
   base::WeakPtrFactory<InProgressDownloadManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InProgressDownloadManager);