reintroduce InterceptDownloadResourceThrottle for some OMA DRM downloads

chrome/browser/android/download/download_controller_base.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_CONTROLLER_BASE_H_
 #define CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_CONTROLLER_BASE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 18 matching lines @@
 struct DownloadInfo {
   explicit DownloadInfo(const net::URLRequest* request);
   DownloadInfo(const DownloadInfo& other);
   ~DownloadInfo();
 
   // The URL from which we are downloading. This is the final URL after any
   // redirection by the server for |original_url_|.
   GURL url;
   // The original URL before any redirection by the server for this URL.
   GURL original_url;
-  int64_t total_bytes;
   std::string content_disposition;
   std::string original_mime_type;
   std::string user_agent;
   std::string cookie;
   std::string referer;
-  bool has_user_gesture;
-
-  content::WebContents* web_contents;
-  // Default copy constructor is used for passing this struct by value.
 };
 
 // Interface to request GET downloads and send notifications for POST
 // downloads.
 class DownloadControllerBase : public content::DownloadItem::Observer {
  public:
   // Returns the singleton instance of the DownloadControllerBase.
   static DownloadControllerBase* Get();
 
   // Called to set the DownloadControllerBase instance.
@@ skipping 17 matching lines @@
 
   // Called to prompt the user for file access permission. When finished,
   // |callback| will be executed.
   virtual void AcquireFileAccessPermission(
       content::WebContents* web_contents,
       const AcquireFileAccessPermissionCallback& callback) = 0;
 
   // Called by unit test to approve or disapprove file access request.
   virtual void SetApproveFileAccessRequestForTesting(bool approve) {}
 
+  // Starts a new download request with Android DownloadManager.
+  virtual void CreateGETDownload(

[David Trainor- moved to gerrit, 2017/01/24 17:13:35]

Who calls this?

[qinmin, 2017/01/24 17:32:24]

InterceptDownloadResourceThrottle calls this to let Android Downloadmanager
intercept the download

+      const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
+      const DownloadInfo& info) = 0;
+
  protected:
   ~DownloadControllerBase() override {}
   static DownloadControllerBase* download_controller_;
 };
 
 #endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_CONTROLLER_BASE_H_