[scheduler] Split suspendable tq from unthrottled tq.

third_party/WebKit/Source/platform/WebFrameScheduler.h

 // Copyright 2015 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 WebFrameScheduler_h
 #define WebFrameScheduler_h
 
 #include "wtf/RefPtr.h"
 
 #include <memory>
@@ skipping 33 matching lines @@
   virtual void setCrossOrigin(bool) {}
 
   // Returns the WebTaskRunner for loading tasks.
   // WebFrameScheduler owns the returned WebTaskRunner.
   virtual RefPtr<WebTaskRunner> loadingTaskRunner() = 0;
 
   // Returns the WebTaskRunner for timer tasks.
   // WebFrameScheduler owns the returned WebTaskRunner.
   virtual RefPtr<WebTaskRunner> timerTaskRunner() = 0;
 
+  // Returns the WebTaskRunner for tasks which shouldn't get throttled,
+  // but can be suspended.
+  // TODO(altimin): This is transitional task runner. Unthrottled task runner

[haraken, 2017/03/22 23:48:34]

a transitional task runner

+  // would become suspendable in the nearest future and a new unsuspended
+  // task runner will be added.
+  virtual RefPtr<WebTaskRunner> suspendableTaskRunner() = 0;
+
   // Returns the WebTaskRunner for tasks which should never get throttled.
   // This is generally used for executing internal browser tasks which should
   // never be throttled. Ideally only tasks whose performance characteristics
   // are known should be posted to this task runner; for example user
   // JavaScript is discouraged. WebFrameScheduler owns the returned
   // WebTaskRunner.
   virtual RefPtr<WebTaskRunner> unthrottledTaskRunner() = 0;
 
   // Returns the parent WebViewScheduler.
   virtual WebViewScheduler* webViewScheduler() { return nullptr; }
@@ skipping 19 matching lines @@
   // connection (websocket, webrtc, etc). When connection is closed this handle
   // must be destroyed.
   virtual std::unique_ptr<ActiveConnectionHandle> onActiveConnectionCreated() {
     return nullptr;
   };
 };
 
 }  // namespace blink
 
 #endif  // WebFrameScheduler_h