Retry installing with UI if silent installation is unsuccessful.

cloud_print/virtual_driver/win/install/setup.cc

 // Copyright (c) 2012 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.
 
 #include <windows.h>
 #include <setupapi.h>  // Must be included after windows.h
 #include <winspool.h>
 #include <stddef.h>
 
 #include <iomanip>
@@ skipping 131 matching lines @@
   DWORD size = MAX_PATH * 10;
   wchar_t package_path[MAX_PATH * 10] = {0};
 
   base::FilePath inf_file = install_path.Append(kInfFileName);
   base::string16 driver_name = LoadLocalString(IDS_DRIVER_NAME);
 
   HRESULT result = UploadPrinterDriverPackage(
       NULL, inf_file.value().c_str(), NULL,
       UPDP_SILENT_UPLOAD | UPDP_UPLOAD_ALWAYS, NULL, package_path, &size);
   if (FAILED(result)) {
-    LOG(ERROR)
-        << "Uploading the printer driver package to the driver cache failed.";
-    return result;
+    LOG(WARNING)
+        << "Uploading the printer driver package to the driver cache silently "
+        << "failed. Will retry with user UI. HRESULT=0x" << std::setbase(16)
+        << result;
+
+    result = UploadPrinterDriverPackage(
+        NULL, inf_file.value().c_str(), NULL, UPDP_UPLOAD_ALWAYS,
+        GetForegroundWindow(), package_path, &size);
+
+    if (FAILED(result)) {
+      LOG(WARNING)
+          << "Uploading the printer driver package to the driver cache failed"
+          << "with user UI. Aborting.";
+      return result;
+    }
   }
 
   result = InstallPrinterDriverFromPackage(
       NULL, package_path, driver_name.c_str(), NULL, IPDFP_COPY_ALL_FILES);
   if (FAILED(result)) {
     LOG(ERROR) << "Installing the printer driver failed.";
   }
   return result;
 }
 
@@ skipping 235 matching lines @@
 
   VLOG(0) << GetErrorMessage(retval) << " HRESULT=0x" << std::setbase(16)
           << retval;
 
   // Installer is silent by default as required by Google Update.
   if (base::CommandLine::ForCurrentProcess()->HasSwitch("verbose")) {
     DisplayWindowsMessage(NULL, retval, LoadLocalString(IDS_DRIVER_NAME));
   }
   return retval;
 }