Added quota client for serviceworker. Enables 'clear past <time> data'.

content/browser/service_worker/service_worker_context_wrapper.h

Index: content/browser/service_worker/service_worker_context_wrapper.h
diff --git a/content/browser/service_worker/service_worker_context_wrapper.h b/content/browser/service_worker/service_worker_context_wrapper.h
index 9f6d060e9a4c039647f33bd56c5b86330a3aeda1..46b76e7b6a6b351b4de0fe3d066965cfc2c79675 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.h
+++ b/content/browser/service_worker/service_worker_context_wrapper.h
@@ -74,6 +74,8 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
       OVERRIDE;
   virtual void Terminate() OVERRIDE;
   virtual void GetAllOriginsInfo(const GetUsageInfoCallback& callback) OVERRIDE;
+  // Callback is called on the IO thread.
+  void DeleteForOrigin(const GURL& origin_url, const ResultCallback& done);

[jsbell, 2014/10/08 19:26:41]

`done` is a bit unusual - it should probably be a noun. Usually `continuation`,
`callback` or `done_callback`.

[dmurph, 2014/10/11 00:02:26]

Done.

   virtual void DeleteForOrigin(const GURL& origin_url) OVERRIDE;
 
   void AddObserver(ServiceWorkerContextObserver* observer);
@@ -112,6 +114,7 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
       const std::vector<ServiceWorkerRegistrationInfo>& registrations);
   void DidGetAllRegistrationsForDeleteForOrigin(
       const GURL& origin,
+      const ResultCallback& done,

[jsbell, 2014/10/08 19:26:41]

nit: callbacks usually come first or last... is there a reason to have it in the
middle?

[dmurph, 2014/10/11 00:02:26]

Done.

       const std::vector<ServiceWorkerRegistrationInfo>& registrations);
 
   const scoped_refptr<ObserverListThreadSafe<ServiceWorkerContextObserver> >