Support serving offline page by offline ID

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 offline_pages {
 
 // Header that indicates that the offline page should be loaded if it exists
 // regardless current network conditions. Its value is a comma/space separated
 // name-value pair that may provide reason or define custom behavior.
-extern const char kLoadingOfflinePageHeader[];
-// The name used in name-value pair of kLoadingOfflinePageHeader to denote the
-// reason for loading offline page.
-extern const char kLoadingOfflinePageReason[];
+extern const char kOfflinePageHeader[];
+// The name used in name-value pair of kOfflinePageHeader to tell if the offline
+// info in this header should be persisted across session restore.
+extern const char kOfflinePageHeaderPersistKey[];
+// The name used in name-value pair of kOfflinePageHeader to denote the reason
+// for loading offline page.
+extern const char kOfflinePageHeaderReasonKey[];
 // Possible values in name-value pair that denote the reason for loading offline
 // page.
-extern const char kLoadingOfflinePageDueToNetError[];
+extern const char kOfflinePageHeaderReasonValueDueToNetError[];
+extern const char kOfflinePageHeaderReasonValueFromDownload[];
+// The name used in name-value pair of kOfflinePageHeader to denote the offline
+// ID of the offline page to load.
+extern const char kOfflinePageHeaderIDKey[];
 
 // 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.
   // NOTE: because this is used for UMA reporting, these values should not be
@@ skipping 29 matching lines @@
 
     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(void* profile_id,
-                                       net::URLRequest* request,
+  static OfflinePageRequestJob* Create(net::URLRequest* request,
                                        net::NetworkDelegate* network_delegate);
 
   ~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(void* profile_id,
-                        net::URLRequest* request,
+  OfflinePageRequestJob(net::URLRequest* request,
                         net::NetworkDelegate* network_delegate);
 
   void StartAsync();
 
   // Restarts the request job in order to fall back to the default handling.
   void FallbackToDefault();
 
-  // The profile for processing offline pages.
-  void* profile_id_;
-
   std::unique_ptr<Delegate> delegate_;
 
   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_