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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef UnderlyingSource_h
      6 #define UnderlyingSource_h
      7 
      8 #include "bindings/core/v8/ScriptPromise.h"
      9 #include "bindings/core/v8/ScriptValue.h"
     10 #include "platform/heap/Heap.h"
     11 
     12 namespace blink {
     13 
     14 class ExceptionState;
     15 class ScriptState;
     16 
     17 class UnderlyingSource : public GarbageCollectedMixin {
     18 public:
     19     virtual ~UnderlyingSource() { }
     20 
     21     virtual void pullSource() = 0;
     22     virtual ScriptPromise cancelSource(ScriptState*, ScriptValue reason) = 0;
     23     virtual void trace(Visitor*) { }
     24 };
     25 
     26 } // namespace blink
     27 
     28 #endif // UnderlyingSource_h
     29 
     30