Add the beginning of a public Service Worker API.

content/public/browser/service_worker_context.h

 // Copyright 2013 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_SERVICE_WORKER_SERVICE_WORKER_CONTEXT_H_
-#define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_CONTEXT_H_
+#ifndef CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_CONTEXT_H_
+#define CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_CONTEXT_H_
 
 #include "base/basictypes.h"
+#include "base/callback_forward.h"
+#include "url/gurl.h"
 
 namespace content {
 
-// Represents the per-BrowserContext ServiceWorker data.
+// Represents the per-StoragePartition ServiceWorker data.  Must be used from
+// the UI thread.
 class ServiceWorkerContext {
  public:
-  // TODO(michaeln): This class is a place holder for content/public api
-  // which will come later. Promote this class when we get there.
+  // https://rawgithub.com/slightlyoff/ServiceWorker/master/spec/service_worker/index.html#url-scope:
+  // roughly, must be of the form "<origin>/<path>/*".
+  typedef GURL Scope;
+
+  typedef base::Callback<void(bool success)> ResultCallback;
+
+  // Equivalent to calling navigator.serviceWorker.register(script_url, {scope:
+  // pattern}) from a renderer in |source_process_id|, except that |pattern| is
+  // an absolute URL instead of relative to some current origin.  |callback| is
+  // passed true when the JS promise is fulfilled or false when the JS
+  // promise is rejected.
+  //
+  // The registration can fail if:
+  //  * |script_url| is on a different origin from |pattern|
+  //  * Fetching |script_url| fails.
+  //  * |script_url| fails to parse or its top-level execution fails.
+  //    TODO: The error message for this needs to be available to developers.
+  //  * Something unexpected goes wrong, like a renderer crash or a full disk.
+  virtual void RegisterServiceWorker(const Scope& pattern,
+                                     const GURL& script_url,
+                                     int source_process_id,
+                                     const ResultCallback& callback) = 0;
+
+  // Equivalent to calling navigator.serviceWorker.unregister(pattern) from a
+  // renderer in |source_process_id|, except that |pattern| is an absolute URL
+  // instead of relative to some current origin.  |callback| is passed true
+  // when the JS promise is fulfilled or false when the JS promise is rejected.
+  //
+  // Unregistration can fail if:
+  //  * No Service Worker was registered for |pattern|.
+  //  * Something unexpected goes wrong, like a renderer crash.
+  virtual void UnregisterServiceWorker(const Scope& pattern,
+                                       int source_process_id,
+                                       const ResultCallback& callback) = 0;
+
+  // TODO(jyasskin): Provide a way to SendMessage to a Scope.
 
  protected:
   ServiceWorkerContext() {}
   virtual ~ServiceWorkerContext() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ServiceWorkerContext);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_CONTEXT_H_
+#endif  // CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_CONTEXT_H_