Keep track of ServiceWorkerContext's BrowserContext and expose it.

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 56367eee1cebbe645a0e4dc537f57aa68eec1d45..8494035e9fa9a47bc642b7f882fe26e3f48cc1a5 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.h
+++ b/content/browser/service_worker/service_worker_context_wrapper.h
@@ -35,6 +35,7 @@ class BrowserContext;
 class ChromeBlobStorageContext;
 class ServiceWorkerContextCore;
 class ServiceWorkerContextObserver;
+class StoragePartitionImpl;
 
 // A refcounted wrapper class for our core object. Higher level content lib
 // classes keep references to this class on mutliple threads. The inner core
@@ -61,6 +62,12 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
   // The core context is only for use on the IO thread.
   ServiceWorkerContextCore* context();
 
+  // The StoragePartition should only be used on the UI thread.
+  // Can be null before/during init and during/after shutdown.
+  StoragePartitionImpl* storage_partition() const;
+
+  void set_storage_partition(StoragePartitionImpl* storage_partition);
+
   // The process manager can be used on either UI or IO.
   ServiceWorkerProcessManager* process_manager() {
     return process_manager_.get();
@@ -130,6 +137,9 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
 
   // Initialized in Init(); true if the user data directory is empty.
   bool is_incognito_;
+
+  // Raw pointer to the StoragePartitionImpl owning |this|.
+  StoragePartitionImpl* storage_partition_;
 };
 
 }  // namespace content