Use sequence<T> instead of T[] where possible and document exceptions

third_party/WebKit/Source/modules/quota/StorageQuota.idl

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// https://w3c.github.io/quota-api/#storagetype-enum
+
 enum StorageType {
     "temporary",
     "persistent"
 };
 
+// https://w3c.github.io/quota-api/#storagequota-interface
+
 [
     NoInterfaceObject,
     RuntimeEnabled=QuotaPromise
 ] interface StorageQuota {
+    // TODO(jsbell): |supportedTypes| should be FrozenArray<StorageType>.
+    // https://github.com/w3c/quota-api/issues/5
     readonly attribute StorageType[] supportedTypes;
     [CallWith=ScriptState] Promise queryInfo(StorageType type);
     [CallWith=ScriptState] Promise requestPersistentQuota([Clamp] unsigned long long newQuota);
 };