Use parallel queue for StorageBucketManager (#110)

* Create parallel queue

* Update bucket manager to use parallel queue

* Address comments

* Fix english

index.bs

@@ -52,6 +52,8 @@ Each [=environment settings object=] has an associated {{StorageBucketManager}}
 The <dfn attribute for=NavigatorStorageBuckets><code>storageBuckets</code></dfn>
 getter steps are to return [=this=]'s [=/relevant settings object=]'s {{StorageBucketManager}} object.
 
+A user agent has an associated <dfn for=StorageBucketManager><code>storage bucket manager</code></dfn> which is the result of [=starting a new parallel queue=].
+
 <xmp class="idl">
 [Exposed=(Window,Worker),
  SecureContext]
@@ -82,11 +84,17 @@ The <dfn method for="StorageBucketManager">open(|name|, |options|)</dfn> method
 
 1. If the result of [=validate a bucket name=] with |name| is failure,  then return [=a promise rejected with=] a {{TypeError}}.
 
-1. Let |r| be the result of running [=open a bucket=] with |shelf|, |name|, and |options|.
+1. Let |p| be [=a new promise=].
+
+1. [=Enqueue the following steps=] to [=StorageBucketManager/storage bucket manager=]:
 
-1. If |r| is failure, then return [=a promise rejected with=] a {{TypeError}}.
+    1. Let |r| be the result of running [=open a bucket=] with |shelf|, |name|, and |options|.
 
-1. Return [=a promise resolved with=] with |r|.
+    1. If |r| is failure, then [=queue a storage task=] to [=/reject=] |p| with a {{TypeError}}.
+
+    1. Otherwise, [=queue a storage task=] to [=/resolve=] |p| with |r|.
+
+1. Return |p|.
 
 </div>
 
@@ -182,15 +190,13 @@ The <dfn method for="StorageBucketManager">delete(|name|)</dfn> method steps are
 
 1. Let |p| be [=a new promise=].
 
-1. Run the following steps [=in parallel=]:
+1. If the result of [=validate a bucket name=] with |name| is failure, then [=/reject=] |p| with an {{InvalidCharacterError}}.
 
-    1. If the result of [=validate a bucket name=] with |name| is failure, then [=/reject=] |p| with an {{InvalidCharacterError}} and abort these steps.
+1. Otherwise, [=enqueue the following steps=] to [=StorageBucketManager/storage bucket manager=]:
 
-    1. Let |r| be the result of running [=remove a bucket=] with |shelf| and |name|.
+    1. Run [=remove a bucket=] with |shelf| and |name|.
 
-    1. If |r| is failure, then [=/reject=] |p| with {{TypeError}}.
-
-    1. Otherwise, [=/resolve=] |p|.
+    1. [=Queue a storage task=] to [=/resolve=] |p|.
 
 1. Return |p|.
 
@@ -236,13 +242,15 @@ The <dfn method for="StorageBucketManager">keys()</dfn> method steps are:
 
 1. Let |keys| be a new [=/list=].
 
-1. For each |key| in |shelf|'s [=bucket map=], run the following steps:
+1. [=Enqueue the following steps=] to [=StorageBucketManager/storage bucket manager=]:
+
+    1. For each |key| in |shelf|'s [=bucket map=], run the following steps:
 
-    1. Let |bucket| be the result of running [=get or expire a bucket=] with |shelf| and |key|. 
+        1. Let |bucket| be the result of running [=get or expire a bucket=] with |shelf| and |key|. 
 
-    1. If |bucket| is non-null, [=list/append=] |key| to |keys|.
+        1. If |bucket| is non-null, [=list/append=] |key| to |keys|.
 
-1. [=Queue a storage task=] to [=/resolve=] |p| with |keys|.
+    1. [=Queue a storage task=] to [=/resolve=] |p| with |keys|.
 
 1. Return |p|.