[inspector] added inspector test runner [part 1]

test/inspector-protocol/task-runner.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_TEST_INSPECTOR_PROTOCOL_TASK_RUNNER_H_
+#define V8_TEST_INSPECTOR_PROTOCOL_TASK_RUNNER_H_
+
+#include "include/v8-inspector.h"
+#include "include/v8-platform.h"
+#include "include/v8.h"
+#include "src/base/macros.h"
+#include "src/base/platform/platform.h"
+#include "src/inspector/string-16.h"
+#include "src/locked-queue-inl.h"
+
+class TaskRunner : public v8::base::Thread {
+ public:
+  class Task {
+   public:
+    virtual ~Task() {}
+    virtual bool is_inspector_task() = 0;
+    virtual void Run(v8::Isolate* isolate,
+                     const v8::Global<v8::Context>& context) = 0;
+  };
+
+  explicit TaskRunner(v8::ExtensionConfiguration* extensions,
+                      v8::base::Semaphore* ready_semaphore);
+  virtual ~TaskRunner();
+
+  // Thread implementation.
+  void Run() override;
+
+  // Should be called from the same thread and only from task.
+  void RunMessageLoop(bool only_protocol);
+  void QuitMessageLoop();
+
+  // TaskRunner takes ownership.
+  void Append(Task* task);
+
+  static TaskRunner* FromContext(v8::Local<v8::Context>);
+
+ private:
+  void InitializeContext();
+  Task* GetNext(bool only_protocol);
+
+  v8::ExtensionConfiguration* extensions_;
+  v8::base::Semaphore* ready_semaphore_;
+
+  v8::Isolate* isolate_;
+  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_.
+  v8::internal::LockedQueue<Task*> queue_;
+  v8::internal::LockedQueue<Task*> deffered_queue_;
+  v8::base::Semaphore process_queue_semaphore_;
+
+  int nested_loop_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(TaskRunner);
+};
+
+class ExecuteStringTask : public TaskRunner::Task {
+ public:
+  explicit ExecuteStringTask(const v8_inspector::StringView& expression);
+  bool is_inspector_task() override { return false; }
+
+  void Run(v8::Isolate* isolate,
+           const v8::Global<v8::Context>& context) override;
+
+ private:
+  v8_inspector::String16 expression_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExecuteStringTask);
+};
+
+#endif  //  V8_TEST_INSPECTOR_PROTOCOL_TASK_RUNNER_H_