Retry WebAPK download if fails for the first time.

chrome/browser/android/webapk/webapk_installer.h

Index: chrome/browser/android/webapk/webapk_installer.h
diff --git a/chrome/browser/android/webapk/webapk_installer.h b/chrome/browser/android/webapk/webapk_installer.h
index eb24f5b2ce428e14f5fb30f19b64f6a1de3fc09b..767002dec666f878e350c326341351263b04b1ac 100644
--- a/chrome/browser/android/webapk/webapk_installer.h
+++ b/chrome/browser/android/webapk/webapk_installer.h
@@ -149,10 +149,18 @@ class WebApkInstaller : public net::URLFetcherDelegate {
   void OnGotWebApkDownloadUrl(const GURL& download_url,
                               const std::string& package_name);
 
+  // Downloads the WebAPK from the given |donwload_url|.

[pkotwicz, 2016/09/27 19:47:28]

Nit: |donwload_url| -> |download_url|.

[Xi Han, 2016/09/27 20:53:31]

Done.

+  void StartDownloadingWebApk(const base::FilePath& output_path,
+                              const GURL& download_url,
+                              bool retry_if_fails);
+
   // Called once the WebAPK has been downloaded. Makes the downloaded WebAPK
   // world readable and installs the WebAPK if the download was successful.
   // |file_path| is the file path that the WebAPK was downloaded to.
+  // If |retry_if_fails| is true, will sleep 2 seconds and retry the download.

[pkotwicz, 2016/09/27 19:47:28]

You should post a delayed task instead of sleeping. A friendly reminder to
update the documentation here

[Xi Han, 2016/09/27 20:53:31]

Done.

   void OnWebApkDownloaded(const base::FilePath& file_path,
+                          const GURL& download_url,
+                          bool retry_if_fails,
                           FileDownloader::Result result);
 
   // Called once the downloaded WebAPK has been made world readable. Installs