Initial framework setup and skeleton for BackgroundFetchContext

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 "base/macros.h"
+#include "base/memory/ref_counted.h"
+
+namespace content {
+
+class BrowserContext;
+class ServiceWorkerContextWrapper;
+
+// 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 BackgroundFetchContext
+    : public base::RefCountedThreadSafe<BackgroundFetchContext> {
+ public:
+  BackgroundFetchContext(BrowserContext* browser_context);

[Peter Beverloo, 2017/02/08 12:20:25]

nit: explicit

[harkness, 2017/02/08 16:30:42]

Done.

+
+  // Init and Shutdown are for use on the UI thread when the StoragePartition is
+  // being setup and torn down. The BackgroundFetchContext will watch the
+  // ServiceWorkerContextWrapper so that it can respond to service worker events
+  // such as unregister.
+  void Init(const scoped_refptr<ServiceWorkerContextWrapper>& context);
+
+  // Shutdown must be called before deleting this. Call on the UI thread.
+  void Shutdown();
+
+ protected:
+  friend class base::RefCountedThreadSafe<BackgroundFetchContext>;
+  virtual ~BackgroundFetchContext();
+
+ private:
+  BrowserContext* browser_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(BackgroundFetchContext);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_CONTEXT_H_