Mojo JS bindings: draining a DataPipe

gin/run_microtasks_observer.h

+// Copyright 2014 The Chromium 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 GIN_RUN_MICROTASKS_OBSERVER_H_
+#define GIN_RUN_MICROTASKS_OBSERVER_H_
+
+#include "base/message_loop/message_loop.h"
+#include "v8/include/v8.h"
+
+namespace gin {
+
+// Runs any pending v8 Microtasks each time a task is completed.
+// TODO(hansmuller); At some point perhaps this can be replaced with
+// the (currently experimental) Isolate::SetAutorunMicrotasks() method.
+
+class RunMicrotasksObserver : public base::MessageLoop::TaskObserver {
+ public:
+  RunMicrotasksObserver(v8::Isolate* isolate);
+
+  virtual void WillProcessTask(const base::PendingTask& pending_task) OVERRIDE;
+  virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE;
+
+ private:
+  v8::Isolate* isolate_;
+};
+
+}  // namespace gin
+
+#endif  // GIN_RUN_MICROTASKS_OBSERVER_H_