Add a flag for printf debugging the compiler dispatcher

src/compiler-dispatcher/compiler-dispatcher.h

 // Copyright 2016 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_COMPILER_DISPATCHER_H_
 #define V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_H_
 
 #include <map>
 #include <memory>
 #include <unordered_set>
@@ skipping 102 matching lines @@
   void ScheduleMoreBackgroundTasksIfNeeded();
   void ScheduleIdleTaskFromAnyThread();
   void ScheduleIdleTaskIfNeeded();
   void ScheduleAbortTask();
   void DoBackgroundWork();
   void DoIdleWork(double deadline_in_seconds);
 
   Isolate* isolate_;
   Platform* platform_;
   size_t max_stack_size_;
+
+  // Copy of FLAG_trace_compiler_dispatcher to allow for access from any thread.
+  bool trace_compiler_dispatcher_;
+
   std::unique_ptr<CompilerDispatcherTracer> tracer_;
 
   std::unique_ptr<CancelableTaskManager> task_manager_;
 
   // Mapping from (script id, function literal id) to job. We use a multimap,
   // as script id is not necessarily unique.
   JobMap jobs_;
 
   base::AtomicValue<v8::MemoryPressureLevel> memory_pressure_level_;
 
@@ skipping 25 matching lines @@
   base::AtomicValue<bool> block_for_testing_;
   base::Semaphore semaphore_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilerDispatcher);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_H_