Implement BackgroundFetchManager.fetch() and struct traits

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchBridge.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 BackgroundFetchBridge_h
 #define BackgroundFetchBridge_h
 
 #include <memory>
 #include "modules/serviceworkers/ServiceWorkerRegistration.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/background_fetch/background_fetch.mojom-blink.h"
 #include "wtf/Functional.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
+class BackgroundFetchOptions;
 class BackgroundFetchRegistration;
 
 // The bridge is responsible for establishing and maintaining the Mojo
 // connection to the BackgroundFetchService. It's keyed on an active Service
 // Worker Registration.
 class BackgroundFetchBridge final
     : public GarbageCollectedFinalized<BackgroundFetchBridge>,
       public Supplement<ServiceWorkerRegistration> {
   USING_GARBAGE_COLLECTED_MIXIN(BackgroundFetchBridge);
   WTF_MAKE_NONCOPYABLE(BackgroundFetchBridge);
 
  public:
   using UpdateUICallback = Function<void(mojom::blink::BackgroundFetchError)>;
-  using GetRegistrationCallback =
-      Function<void(mojom::blink::BackgroundFetchError,
-                    BackgroundFetchRegistration*)>;
+  using RegistrationCallback = Function<void(mojom::blink::BackgroundFetchError,
+                                             BackgroundFetchRegistration*)>;
   using GetTagsCallback =
       Function<void(mojom::blink::BackgroundFetchError, const Vector<String>&)>;
 
   static BackgroundFetchBridge* from(ServiceWorkerRegistration*);
   static const char* supplementName();
 
   virtual ~BackgroundFetchBridge();
 
-  // TODO(peter): Implement support for the `fetch()` function in the bridge.
+  // Creates a new Background Fetch registration identified by |tag| with the
+  // given |options| for the sequence of |requests|. The |callback| will be
+  // invoked when the registration has been created.
+  void fetch(const String& tag,
+             const BackgroundFetchOptions&,
+             std::unique_ptr<RegistrationCallback>);
 
   // Updates the user interface for the Background Fetch identified by |tag|
   // with the updated |title|. Will invoke the |callback| when the interface
   // has been requested to update.
   void updateUI(const String& tag,
                 const String& title,
                 std::unique_ptr<UpdateUICallback>);
 
   // Aborts the active Background Fetch for |tag|. Does not respond.
   void abort(const String& tag);
 
   // Gets the Background Fetch registration for the given |tag|. Will invoke the
   // |callback| with the Background Fetch registration, which may be a nullptr
   // if the |tag| does not exist, when the Mojo call has completed.
   void getRegistration(const String& tag,
-                       std::unique_ptr<GetRegistrationCallback>);
+                       std::unique_ptr<RegistrationCallback>);
 
   // Gets the sequence of tags for active Background Fetch registrations. Will
   // invoke the |callback| with the tags when the Mojo call has completed.
   void getTags(std::unique_ptr<GetTagsCallback>);
 
  private:
   explicit BackgroundFetchBridge(ServiceWorkerRegistration&);
 
   // Returns an initialized BackgroundFetchServicePtr. A connection will be
   // established after the first call to this method.
   mojom::blink::BackgroundFetchServicePtr& getService();
 
-  void didGetRegistration(std::unique_ptr<GetRegistrationCallback>,
+  void didGetRegistration(std::unique_ptr<RegistrationCallback>,
                           mojom::blink::BackgroundFetchError,
                           mojom::blink::BackgroundFetchRegistrationPtr);
 
   mojom::blink::BackgroundFetchServicePtr m_backgroundFetchService;
 };
 
 }  // namespace blink
 
 #endif  // BackgroundFetchBridge_h