Abort running compiler dispatcher tasks under memory pressure

src/cancelable-task.h

 // Copyright 2015 the V8 project 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 V8_CANCELABLE_TASK_H_
 #define V8_CANCELABLE_TASK_H_
 
 #include <map>
 
 #include "include/v8-platform.h"
@@ skipping 116 matching lines @@
   // to abort it.
   base::AtomicNumber<intptr_t> cancel_counter_;
 
   friend class CancelableTaskManager;
 
   DISALLOW_COPY_AND_ASSIGN(Cancelable);
 };
 
 
 // Multiple inheritance can be used because Task is a pure interface.
-class CancelableTask : public Cancelable, public Task {
+class V8_EXPORT_PRIVATE CancelableTask : public Cancelable,
+                                         NON_EXPORTED_BASE(public Task) {
  public:
   explicit CancelableTask(Isolate* isolate);
   CancelableTask(Isolate* isolate, CancelableTaskManager* manager);
 
   // Task overrides.
   void Run() final {
     if (TryRun()) {
       RunInternal();
     }
   }
@@ skipping 28 matching lines @@
  private:
   Isolate* isolate_;
   DISALLOW_COPY_AND_ASSIGN(CancelableIdleTask);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CANCELABLE_TASK_H_