Add a test for OptimizingCompileDispatcher::Flush's non-blocking behavior

src/compiler-dispatcher/optimizing-compile-dispatcher.h

 // Copyright 2012 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_COMPILER_DISPATCHER_OPTIMIZING_COMPILE_DISPATCHER_H_
 #define V8_COMPILER_DISPATCHER_OPTIMIZING_COMPILE_DISPATCHER_H_
 
 #include <queue>
 
 #include "src/base/atomicops.h"
 #include "src/base/platform/condition-variable.h"
 #include "src/base/platform/mutex.h"
 #include "src/base/platform/platform.h"
 #include "src/flags.h"
+#include "src/globals.h"
 #include "src/list.h"
 
 namespace v8 {
 namespace internal {
 
 class CompilationJob;
 class SharedFunctionInfo;
 
-class OptimizingCompileDispatcher {
+class V8_EXPORT_PRIVATE OptimizingCompileDispatcher {
  public:
   enum class BlockingBehavior { kBlock, kDontBlock };
 
   explicit OptimizingCompileDispatcher(Isolate* isolate)
       : isolate_(isolate),
         input_queue_capacity_(FLAG_concurrent_recompilation_queue_length),
         input_queue_length_(0),
         input_queue_shift_(0),
         blocked_jobs_(0),
         ref_count_(0),
         recompilation_delay_(FLAG_concurrent_recompilation_delay) {
     base::NoBarrier_Store(&mode_, static_cast<base::AtomicWord>(COMPILE));
     input_queue_ = NewArray<CompilationJob*>(input_queue_capacity_);
   }
 
   ~OptimizingCompileDispatcher();
 
-  void Run();
   void Stop();
   void Flush(BlockingBehavior blocking_behavior);
+  // Takes ownership of |job|.
   void QueueForOptimization(CompilationJob* job);
   void Unblock();
   void InstallOptimizedFunctions();
 
   inline bool IsQueueAvailable() {
     base::LockGuard<base::Mutex> access_input_queue(&input_queue_mutex_);
     return input_queue_length_ < input_queue_capacity_;
   }
 
   static bool Enabled() { return FLAG_concurrent_recompilation; }
@@ skipping 41 matching lines @@
   // background thread.
   //
   // Since flags might get modified while the background thread is running, it
   // is not safe to access them directly.
   int recompilation_delay_;
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_DISPATCHER_OPTIMIZING_COMPILE_DISPATCHER_H_