[inspector] finish test runner gracefully..

test/inspector/task-runner.h

Index: test/inspector/task-runner.h
diff --git a/test/inspector/task-runner.h b/test/inspector/task-runner.h
index fc65ab7cdef3f96f8417bf9a70b077dd5c788659..d78cd390d686e7b15cb318a8398705aa9125ca01 100644
--- a/test/inspector/task-runner.h
+++ b/test/inspector/task-runner.h
@@ -8,6 +8,7 @@
 #include "include/v8-inspector.h"
 #include "include/v8-platform.h"
 #include "include/v8.h"
+#include "src/base/atomic-utils.h"
 #include "src/base/macros.h"
 #include "src/base/platform/platform.h"
 #include "src/locked-queue-inl.h"
@@ -39,6 +40,8 @@ class TaskRunner : public v8::base::Thread {
 
   static TaskRunner* FromContext(v8::Local<v8::Context>);
 
+  void Terminate();
+
  private:
   void InitializeContext();
   Task* GetNext(bool only_protocol);
@@ -51,15 +54,16 @@ class TaskRunner : public v8::base::Thread {
   v8::Global<v8::Context> context_;
 
   // deferred_queue_ combined with queue_ (in this order) have all tasks in the
-  // correct order.
-  // Sometimes we skip non-protocol tasks by moving them from queue_ to
-  // deferred_queue_.
+  // correct order. Sometimes we skip non-protocol tasks by moving them from
+  // queue_ to deferred_queue_.
   v8::internal::LockedQueue<Task*> queue_;
   v8::internal::LockedQueue<Task*> deffered_queue_;
   v8::base::Semaphore process_queue_semaphore_;
 
   int nested_loop_count_;
 
+  v8::base::AtomicNumber<int> is_terminated_;
+
   DISALLOW_COPY_AND_ASSIGN(TaskRunner);
 };