[Offline pages]: Move logic for whether to consider the DocumentAvailableInMainFrame signal to the …

components/offline_pages/core/snapshot_controller.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 COMPONENTS_OFFLINE_PAGES_CORE_SNAPSHOT_CONTROLLER_H_
 #define COMPONENTS_OFFLINE_PAGES_CORE_SNAPSHOT_CONTROLLER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 42 matching lines @@
     // times, but not in overlapping manner - waits until
     // PreviousSnapshotCompleted() before the next StatrSnapshot().
     // Client should overwrite the result of previous snapshot with the new one,
     // it is assumed that later snapshots are better then previous.
     virtual void StartSnapshot() = 0;
 
    protected:
     virtual ~Client() {}
   };
 
-  SnapshotController(
+  // Creates a SnapshotController with document available delay = 7s,
+  // document on load delay = 1s and triggers snapshot on document available.
+  static std::unique_ptr<SnapshotController> CreateForForegroundOfflining(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       SnapshotController::Client* client);
+  // Creates a SnapshotController with document on load delay = 2s
+  // and ignores document available signal.
+  static std::unique_ptr<SnapshotController> CreateForBackgroundOfflining(
+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
+      SnapshotController::Client* client);
+
   SnapshotController(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       SnapshotController::Client* client,
       int64_t delay_after_document_available_ms,
-      int64_t delay_after_document_on_load_completed_ms);
+      int64_t delay_after_document_on_load_completed_ms,
+      bool document_available_triggers_snapshot);
   virtual ~SnapshotController();
 
   // Resets the 'session', returning controller to initial state.
   void Reset();
 
   // Stops current session, no more Client::StartSnapshot calls will be
   // invoked from the SnapshotController until current session is Reset().
   // Called by Client, for example when it encounters an error loading the page.
   void Stop();
 
@@ skipping 15 matching lines @@
  private:
   void MaybeStartSnapshot(PageQuality updated_page_quality);
   void MaybeStartSnapshotThenStop();
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   // Client owns this class.
   SnapshotController::Client* client_;
   SnapshotController::State state_;
   int64_t delay_after_document_available_ms_;
   int64_t delay_after_document_on_load_completed_ms_;
+  bool document_available_triggers_snapshot_;
 
   // The expected quality of a snapshot taken at the moment this value is
   // queried.
   PageQuality current_page_quality_ = PageQuality::POOR;
 
   base::WeakPtrFactory<SnapshotController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotController);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_CORE_SNAPSHOT_CONTROLLER_H_