[Offline Pages] Adds event logs for requests dropped due to number of start or complete attempts.

components/offline_pages/background/request_picker.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_BACKGROUND_REQUEST_PICKER_H_
 #define COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_PICKER_H_
 
 #include <memory>
 
 #include "base/memory/weak_ptr.h"
 #include "components/offline_pages/background/device_conditions.h"
 #include "components/offline_pages/background/offliner_policy.h"
 #include "components/offline_pages/background/request_coordinator.h"
+#include "components/offline_pages/background/request_coordinator_event_logger.h"
 #include "components/offline_pages/background/request_queue.h"
 
 namespace offline_pages {
 
 class RequestNotifier;
 
 typedef bool (RequestPicker::*RequestCompareFunction)(
     const SavePageRequest* left, const SavePageRequest* right);
 
 class RequestPicker {
  public:
   RequestPicker(RequestQueue* requestQueue,
                 OfflinerPolicy* policy,
-                RequestNotifier* notifier);
+                RequestNotifier* notifier,
+                RequestCoordinatorEventLogger* event_logger);
 
   ~RequestPicker();
 
   // Choose which request we should process next based on the current
   // conditions, and call back to the RequestCoordinator when we have one.
   void ChooseNextRequest(
       RequestCoordinator::RequestPickedCallback picked_callback,
       RequestCoordinator::RequestNotPickedCallback not_picked_callback,
       DeviceConditions* device_conditions);
 
@@ skipping 41 matching lines @@
   void OnRequestExpired(
       const RequestQueue::UpdateMultipleRequestResults& results,
       const std::vector<std::unique_ptr<SavePageRequest>> requests);
 
   // Unowned pointer to the request queue.
   RequestQueue* queue_;
   // Unowned pointer to the policy object.
   OfflinerPolicy* policy_;
   // Unowned pointer to the request coordinator.
   RequestNotifier* notifier_;
+  // Unowned pointer to the event logger.
+  RequestCoordinatorEventLogger* event_logger_;
   // Current conditions on the device
   std::unique_ptr<DeviceConditions> current_conditions_;
   // True if we prefer less-tried requests
   bool fewer_retries_better_;
   // True if we prefer requests submitted more recently
   bool earlier_requests_better_;
   // Callback for when we are done picking a request to do next.
   RequestCoordinator::RequestPickedCallback picked_callback_;
   // Callback for when there are no more reqeusts to pick.
   RequestCoordinator::RequestNotPickedCallback not_picked_callback_;
   // Allows us to pass a weak pointer to callbacks.
   base::WeakPtrFactory<RequestPicker> weak_ptr_factory_;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_PICKER_H_