Add a save page request to the request queue (and test it).

components/offline_pages/background/request_coordinator.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_COORDINATOR_H_
 #define COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_COORDINATOR_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "components/keyed_service/core/keyed_service.h"
+#include "components/offline_pages/background/request_queue.h"
 #include "url/gurl.h"
 
 namespace offline_pages {
 
 struct ClientId;
 class OfflinerPolicy;
 class OfflinerFactory;
 class Offliner;
 class SavePageRequest;
 
 // Coordinates queueing and processing save page later requests.
-class RequestCoordinator : public KeyedService {
+class RequestCoordinator :
+    public KeyedService,
+    public base::SupportsWeakPtr<RequestCoordinator>  {
  public:
   // Callback to report when the processing of a triggered task is complete.
   typedef base::Callback<void()> ProcessingDoneCallback;
 
   RequestCoordinator(std::unique_ptr<OfflinerPolicy> policy,
-                     std::unique_ptr<OfflinerFactory> factory);
+                     std::unique_ptr<OfflinerFactory> factory,
+                     std::unique_ptr<RequestQueue> queue);
 
   ~RequestCoordinator() override;
 
   // Queues |request| to later load and save when system conditions allow.
   // Returns true if the page could be queued successfully.
   bool SavePageLater(const GURL& url, const ClientId& client_id);
 
   // Starts processing of one or more queued save page later requests.
   // Returns whether processing was started and that caller should expect
   // a callback. If processing was already active, returns false.
   bool StartProcessing(const ProcessingDoneCallback& callback);
 
   // Stops the current request processing if active. This is a way for
   // caller to abort processing; otherwise, processing will complete on
   // its own. In either case, the callback will be called when processing
   // is stopped or complete.
   void StopProcessing();
 
+  // Returns the request queue used for requests.  Coordinator keeps ownership.
+  RequestQueue* GetQueue() { return queue_.get(); }
+
  private:
-  // RequestCoordinator takes over ownership of the policy
+  void AddRequestResultCallback(RequestQueue::AddRequestResult result,
+                                const SavePageRequest& request);
+  // OfflinerPolicy.  Used to store policies. Owned.
   std::unique_ptr<OfflinerPolicy> policy_;
-  // Factory is owned by the RequestCoordinator.
+  // OfflinerFactory.  Used to create offline pages. Owned.
   std::unique_ptr<OfflinerFactory> factory_;
+  // RequestQueue.  Used to store incoming requests. Owned.
+  std::unique_ptr<RequestQueue> queue_;
 
   DISALLOW_COPY_AND_ASSIGN(RequestCoordinator);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_REQUEST_COORDINATOR_H_