[Downloads] Add context parameter to help center article URL.

chrome/browser/download/download_commands.cc

 // 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.
 
 #include "chrome/browser/download/download_commands.h"
 
+#include "base/strings/stringprintf.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/safe_browsing/download_protection_service.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/scoped_tabbed_browser_displayer.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/generated_resources.h"
 #include "grit/theme_resources.h"
+#include "net/base/url_util.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
 #if defined(OS_WIN)
 #include "chrome/browser/download/download_target_determiner.h"
 #include "chrome/browser/ui/pdf/adobe_reader_info_win.h"
 #endif
 
 DownloadCommands::DownloadCommands(content::DownloadItem* download_item)
     : download_item_(download_item) {
   DCHECK(download_item);
 }
 
-int DownloadCommands::GetCommandIconId(Command command) {
+int DownloadCommands::GetCommandIconId(Command command) const {
   switch (command) {
     case PAUSE:
       return IDR_DOWNLOAD_NOTIFICATION_MENU_PAUSE;
     case RESUME:
       return IDR_DOWNLOAD_NOTIFICATION_MENU_RESUME;
     case SHOW_IN_FOLDER:
       return IDR_DOWNLOAD_NOTIFICATION_MENU_FOLDER;
     case RETRY:
     case KEEP:
       return IDR_DOWNLOAD_NOTIFICATION_MENU_DOWNLOAD;
     case DISCARD:
       return IDR_DOWNLOAD_NOTIFICATION_MENU_DELETE;
     case CANCEL:
       // TODO(yoshiki): This is a temporary image for Download Notification
       // feature behind the flag. We have to replace the image with proper one
       // before the feature launch. http://crbug.com/468559
       return IDR_DOWNLOAD_NOTIFICATION_MENU_DELETE;
     case OPEN_WHEN_COMPLETE:
     case ALWAYS_OPEN_TYPE:
     case PLATFORM_OPEN:
     case LEARN_MORE_SCANNING:
     case LEARN_MORE_INTERRUPTED:
       return -1;
   }
   NOTREACHED();
   return -1;
 }
 
+GURL DownloadCommands::GetLearnMoreURLForInterruptedDownload() const {
+  GURL learn_more_url(chrome::kDownloadInterruptedLearnMoreURL);
+  return net::AppendQueryParameter(
+      learn_more_url, "ctx",
+      base::StringPrintf("%d",
+                         static_cast<int>(download_item_->GetLastReason())));
+}
+
 gfx::Image DownloadCommands::GetCommandIcon(Command command) {
   ResourceBundle& bundle = ResourceBundle::GetSharedInstance();
   return bundle.GetImageNamed(GetCommandIconId(command));
 }
 
 bool DownloadCommands::IsCommandEnabled(Command command) const {
   switch (command) {
     case SHOW_IN_FOLDER:
       return download_item_->CanShowInFolder();
     case OPEN_WHEN_COMPLETE:
@@ skipping 116 matching lines @@
         protection_service->ShowDetailsForDownload(*download_item_,
                                                    GetBrowser());
 #else
       // Should only be getting invoked if we are using safe browsing.
       NOTREACHED();
 #endif
       break;
     }
     case LEARN_MORE_INTERRUPTED:
       GetBrowser()->OpenURL(content::OpenURLParams(
-          GURL(chrome::kDownloadInterruptedLearnMoreURL), content::Referrer(),
+          GetLearnMoreURLForInterruptedDownload(), content::Referrer(),
           NEW_FOREGROUND_TAB, ui::PAGE_TRANSITION_LINK, false));
       break;
     case PAUSE:
       download_item_->Pause();
       break;
     case RESUME:
       download_item_->Resume();
       break;
     case RETRY:
       if (download_item_->CanResume()) {
@@ skipping 28 matching lines @@
     is_adobe_pdf_reader_up_to_date =
         DownloadTargetDeterminer::IsAdobeReaderUpToDate();
   }
   return IsDownloadPdf() &&
          (IsAdobeReaderDefaultPDFViewer() ? is_adobe_pdf_reader_up_to_date
                                           : true);
 #elif defined(OS_MACOSX) || defined(OS_LINUX)
   return IsDownloadPdf();
 #endif
 }