Teach Background Fetch how to start a new fetch.

content/browser/background_fetch/background_fetch_context.h

 // Copyright 2017 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 CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_CONTEXT_H_
 #define CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_CONTEXT_H_
 
+#include <string>
+#include <vector>
 #include <unordered_map>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/background_fetch/background_fetch_data_manager.h"
 #include "content/browser/background_fetch/background_fetch_job_controller.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/browser_thread.h"
+#include "third_party/WebKit/public/platform/modules/background_fetch/background_fetch.mojom.h"
+
+namespace url {
+class Origin;
+}
 
 namespace content {
 
 class BackgroundFetchJobInfo;
+struct BackgroundFetchOptions;
+class BackgroundFetchRegistrationId;
 class BackgroundFetchRequestInfo;
 class BrowserContext;
 class ServiceWorkerContextWrapper;
+struct ServiceWorkerFetchRequest;
 
 // The BackgroundFetchContext is the central moderator of ongoing background
 // fetch requests from the Mojo service and from other callers.
 // Background Fetch requests function similar to normal fetches except that
 // they are persistent across Chromium or service worker shutdown.
 class CONTENT_EXPORT BackgroundFetchContext
     : public base::RefCountedThreadSafe<BackgroundFetchContext,
                                         BrowserThread::DeleteOnUIThread> {
  public:
   // The BackgroundFetchContext will watch the ServiceWorkerContextWrapper so
   // that it can respond to service worker events such as unregister.
   BackgroundFetchContext(
       BrowserContext* browser_context,
       StoragePartition* storage_partition,
       const scoped_refptr<ServiceWorkerContextWrapper>& context);
 
-  // Init and Shutdown are for use on the UI thread when the StoragePartition is
-  // being setup and torn down.
-  void Init();
-
   // Shutdown must be called before deleting this. Call on the UI thread.
   void Shutdown();
 
+  // Starts a Background Fetch for the |registration_id|. The |requests| will be
+  // asynchronously fetched. The |callback| will be invoked when the fetch has
+  // been registered, or an error occurred that avoids it from doing so.
+  void StartFetch(
+      const BackgroundFetchRegistrationId& registration_id,
+      const std::vector<ServiceWorkerFetchRequest>& requests,
+      const BackgroundFetchOptions& options,
+      const blink::mojom::BackgroundFetchService::FetchCallback& callback);
+
+  // Returns the active Background Fetch job for the |registration_id|. Will
+  // return a nullptr when there is no such job. The value returned from this
+  // method should not be cached for later use.
+  BackgroundFetchJobController* GetActiveJobForRegistrationId(
+      const BackgroundFetchRegistrationId& registration_id) const;
+
   BackgroundFetchDataManager* GetDataManagerForTesting() {
     return &background_fetch_data_manager_;
   }
 
  private:
   friend class base::DeleteHelper<BackgroundFetchContext>;
   friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
   friend class base::RefCountedThreadSafe<BackgroundFetchContext,
                                           BrowserThread::DeleteOnUIThread>;
 
   ~BackgroundFetchContext();
 
-  void CreateRequest(std::unique_ptr<BackgroundFetchJobInfo> job_info,
-                     std::vector<BackgroundFetchRequestInfo>& request_infos);
+  // Called when a new registration has been created by the data manager.
+  void DidCreateCreateRegistration(
+      const BackgroundFetchRegistrationId& registration_id,
+      const BackgroundFetchOptions& options,
+      const blink::mojom::BackgroundFetchService::FetchCallback& callback,
+      blink::mojom::BackgroundFetchError error,
+      std::unique_ptr<BackgroundFetchJobData> job_data);
 
   // Callback for the JobController when the job is complete.
   void DidCompleteJob(const std::string& job_guid);
 
   void ShutdownOnIO();
 
   // |this| is owned by the BrowserContext via the StoragePartition.
   BrowserContext* browser_context_;
   StoragePartition* storage_partition_;
 
   scoped_refptr<ServiceWorkerContextWrapper> service_worker_context_;
   BackgroundFetchDataManager background_fetch_data_manager_;
 
-  std::unordered_map<std::string, std::unique_ptr<BackgroundFetchJobController>>
-      job_map_;
+  std::vector<std::unique_ptr<BackgroundFetchJobController>> controllers_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundFetchContext);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_CONTEXT_H_