Use the previews black list for offline previews

chrome/browser/android/offline_pages/offline_page_request_job.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_OFFLINE_PAGES_OFFLINE_PAGE_REQUEST_JOB_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_REQUEST_JOB_H_
 
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/resource_request_info.h"
 #include "content/public/common/resource_type.h"
 #include "net/url_request/url_request_file_job.h"
 
 namespace base {
 class FilePath;
 }
 
+namespace previews {
+class PreviewsDecider;
+}
+
 namespace offline_pages {
 
 // A request job that serves content from offline file.
 class OfflinePageRequestJob : public net::URLRequestFileJob {
  public:
   // This enum is used for UMA reporting. It contains all possible outcomes of
   // handling requests that might service offline page in different network
   // conditions. Generally one of these outcomes will happen.
   // The fringe errors (like no OfflinePageModel, etc.) are not reported due
   // to their low probability.
@@ skipping 29 matching lines @@
     GetWebContentsGetter(net::URLRequest* request) const = 0;
 
     virtual TabIdGetter GetTabIdGetter() const = 0;
   };
 
   // Reports the aggregated result combining both request result and network
   // state.
   static void ReportAggregatedRequestResult(AggregatedRequestResult result);
 
   // Creates and returns a job to serve the offline page. Nullptr is returned if
-  // offline page cannot or should not be served.
-  static OfflinePageRequestJob* Create(net::URLRequest* request,
-                                       net::NetworkDelegate* network_delegate);
+  // offline page cannot or should not be served. Embedder must gaurantee that
+  // |previews_decider| outlives the returned instance.
+  static OfflinePageRequestJob* Create(
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate,
+      previews::PreviewsDecider* previews_decider);
 
   ~OfflinePageRequestJob() override;
 
   // net::URLRequestJob overrides:
   void Start() override;
   void Kill() override;
 
   void OnOfflineFilePathAvailable(const base::FilePath& offline_file_path);
 
   void SetDelegateForTesting(std::unique_ptr<Delegate> delegate);
 
  private:
   OfflinePageRequestJob(net::URLRequest* request,
-                        net::NetworkDelegate* network_delegate);
+                        net::NetworkDelegate* network_delegate,
+                        previews::PreviewsDecider* previews_decider);
 
   void StartAsync();
 
   // Restarts the request job in order to fall back to the default handling.
   void FallbackToDefault();
 
   std::unique_ptr<Delegate> delegate_;
 
+  // Used to determine if an URLRequest is eligible for offline previews.
+  previews::PreviewsDecider* previews_decider_;
+
   base::WeakPtrFactory<OfflinePageRequestJob> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflinePageRequestJob);
 };
 
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_REQUEST_JOB_H_