Debugger: Add worker helper function.

Worker:
- Add helper to check if the background worker thread has any unfinished
  jobs in its queue.

src/apps/debugger/util/Worker.cpp

@@ -342,6 +342,14 @@ Worker::ResumeJob(Job* job)
 }
 
 
+bool
+Worker::HasPendingJobs()
+{
+	AutoLocker<Worker> locker(this);
+	return !fJobs.IsEmpty();
+}
+
+
 status_t
 Worker::AddListener(const JobKey& key, JobListener* listener)
 {

src/apps/debugger/util/Worker.h

@@ -149,6 +149,8 @@ public:
 									// only valid for jobs that are
 									// suspended pending user input
 
+			bool				HasPendingJobs();
+
 			status_t			AddListener(const JobKey& key,
 									JobListener* listener);
 			void				RemoveListener(const JobKey& key,