[ServiceWorker] Added size deltas and total size computation for QuotaM.

content/browser/service_worker/service_worker_quota_client.cc

Index: content/browser/service_worker/service_worker_quota_client.cc
diff --git a/content/browser/service_worker/service_worker_quota_client.cc b/content/browser/service_worker/service_worker_quota_client.cc
index e2697e2303a62054a46c8736bac95798123ba30d..dc4dd8385db829e9acd1dad7eb3f6eb931a084fa 100644
--- a/content/browser/service_worker/service_worker_quota_client.cc
+++ b/content/browser/service_worker/service_worker_quota_client.cc
@@ -30,6 +30,15 @@ void ReportToQuotaStatus(const QuotaClient::DeletionCallback& callback,
   callback.Run(status ? storage::QuotaStatusCode::kQuotaStatusOk
                       : storage::QuotaStatusCode::kQuotaStatusUnknown);
 }
+
+void AccumulateUsage(const QuotaClient::GetUsageCallback& callback,
+                     const std::vector<ServiceWorkerUsageInfo>& usage_info) {
+  int64 usage_total = 0;
+  for (const auto& info : usage_info) {
+    usage_total += info.total_size_bytes;
+  }
+  callback.Run(usage_total);
+}
 }  // namespace
 
 ServiceWorkerQuotaClient::ServiceWorkerQuotaClient(
@@ -52,8 +61,11 @@ void ServiceWorkerQuotaClient::GetOriginUsage(
     const GURL& origin,
     storage::StorageType type,
     const GetUsageCallback& callback) {
-  // TODO(dmurph): Add usage fetching when information is available.
-  callback.Run(0);
+  if (type != storage::StorageType::kStorageTypeTemporary) {
+    callback.Run(0);
+    return;
+  }
+  context_->GetAllOriginsInfo(base::Bind(&AccumulateUsage, callback));

[michaeln, 2014/10/24 23:15:47]

The method is supposed to return the amount of data stored by just the one
|origin|.

  // Gets the amount of data stored in the storage specified by
  // |origin_url| and |type|.

[dmurph, 2014/10/27 21:37:06]

Done.

 }
 
 void ServiceWorkerQuotaClient::GetOriginsForType(