Specify TaskType of posted Task explicitly in Quota API (13)

third_party/WebKit/Source/core/dom/TaskRunnerHelper.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TaskRunnerHelper_h
 #define TaskRunnerHelper_h
 
 #include "core/CoreExport.h"
 #include "wtf/Allocator.h"
 #include "wtf/HashTraits.h"
@@ skipping 20 matching lines @@
   Timer,
   RemoteEvent,
   WebSocket,
   PostedMessage,
   UnshippedPortMessage,
   FileReading,
   DatabaseAccess,
   Presentation,
   Sensor,
 
+  // Use MiscPlatformAPI for a task that is defined in the spec but is not yet
+  // associated with any specific task runner in the spec. MiscPlatformAPI is
+  // not encouraged for stable and matured APIs. The spec should define the task
+  // runner explicitly.
+  // The task runner may be throttled.
+  MiscPlatformAPI,
+
   // Other internal tasks that cannot fit any of the above task runners
   // can be posted here, but the usage is not encouraged. The task runner
   // may be throttled.
   //
   // UnspecedLoading type should be used for all tasks associated with
   // loading page content, UnspecedTimer should be used for all other purposes.
   UnspecedTimer,
   UnspecedLoading,
 
   // Tasks that must not be throttled should be posted here, but the usage
@@ skipping 10 matching lines @@
   static const bool emptyValueIsZero = false;
   static TaskType emptyValue() { return static_cast<TaskType>(-1); }
   static void constructDeletedValue(TaskType& slot, bool) {
     slot = static_cast<TaskType>(-2);
   }
   static bool isDeletedValue(TaskType value) {
     return value == static_cast<TaskType>(-2);
   }
 };
 
+// A set of helper functions to get a WebTaskRunner for TaskType and a context
+// object. The posted tasks are guaranteed to run in a sequence if they have the
+// same TaskType and the context objects belong to the same frame.
 class CORE_EXPORT TaskRunnerHelper final {
   STATIC_ONLY(TaskRunnerHelper);
 
  public:
   static WebTaskRunner* get(TaskType, LocalFrame*);
   static WebTaskRunner* get(TaskType, Document*);
   static WebTaskRunner* get(TaskType, ExecutionContext*);
   static WebTaskRunner* get(TaskType, ScriptState*);
 };
 
 }  // namespace blink
 
 #endif