reintroduce InterceptDownloadResourceThrottle for some OMA DRM downloads

chrome/browser/android/download/intercept_download_resource_throttle.h

+// Copyright 2017 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_INTERCEPT_DOWNLOAD_RESOURCE_THROTTLE_H_
+#define CHROME_BROWSER_ANDROID_DOWNLOAD_INTERCEPT_DOWNLOAD_RESOURCE_THROTTLE_H_
+
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/android/download/download_controller_base.h"
+#include "content/public/browser/resource_request_info.h"
+#include "content/public/browser/resource_throttle.h"
+#include "net/cookies/cookie_store.h"
+
+namespace net {
+class URLRequest;
+}
+
+// InterceptDownloadResourceThrottle checks if a download request should be
+// handled by Chrome or passsed to the Android Download Manager.
+class InterceptDownloadResourceThrottle : public content::ResourceThrottle {
+ public:
+  InterceptDownloadResourceThrottle(
+      net::URLRequest* request,
+      const content::ResourceRequestInfo::WebContentsGetter& wc_getter);
+  ~InterceptDownloadResourceThrottle() override;
+
+  // content::ResourceThrottle implementation:
+  void WillProcessResponse(bool* defer) override;
+  const char* GetNameForLogging() const override;
+
+ private:
+  void CheckCookiePolicy(const net::CookieList& cookie_list);
+  void StartDownload(const DownloadInfo& info);
+
+  const net::URLRequest* request_;
+  content::ResourceRequestInfo::WebContentsGetter wc_getter_;
+
+  base::WeakPtrFactory<InterceptDownloadResourceThrottle> weak_factory_;
+  DISALLOW_COPY_AND_ASSIGN(InterceptDownloadResourceThrottle);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_INTERCEPT_DOWNLOAD_RESOURCE_THROTTLE_H_