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diff --git a/base/message_loop/message_pump_android.h b/base/message_loop/message_pump_android.h
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+++ b/base/message_loop/message_pump_android.h
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+// Copyright (c) 2012 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 BASE_MESSAGE_LOOP_MESSAGE_PUMP_ANDROID_H_
+#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_ANDROID_H_
+
+#include <jni.h>
+#include <memory>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/base_export.h"
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/message_loop/message_pump.h"
+#include "base/time/time.h"
+
+struct ALooper;
+
+namespace base {
+
+class RunLoop;
+
+// This class implements a MessagePump needed for TYPE_UI MessageLoops on
+// OS_ANDROID platform.
+class BASE_EXPORT MessagePumpForUI : public MessagePump {
+ public:
+  MessagePumpForUI();
+  ~MessagePumpForUI() override;
+
+  void Run(Delegate* delegate) override;
+  void Quit() override;
+  void ScheduleWork() override;
+  void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override;
+
+  // Attaches |delegate| to this native MessagePump. |delegate| will from then
+  // on be invoked by the native loop to process application tasks.
+  virtual void Attach(Delegate* delegate);
+
+  // We call Abort when there is a pending JNI exception, meaning that the
+  // current thread will crash when we return to Java.
+  // We can't call any JNI-methods before returning to Java as we would then
+  // cause a native crash (instead of the original Java crash).
+  void Abort() { should_abort_ = true; }
+  bool IsAborted() { return should_abort_; }
+  bool ShouldQuit() const { return should_abort_ || quit_; }
+
+  // Tells the RunLoop to quit when idle, calling the callback when it's safe
+  // for the Thread to stop.
+  void QuitWhenIdle(base::OnceClosure callback);
+
+  // These functions are only public so that the looper callbacks can call them,
+  // and should not be called from outside this class.
+  void OnDelayedLooperCallback();
+  void OnNonDelayedLooperCallback();
+
+ protected:
+  void SetDelegate(Delegate* delegate) { delegate_ = delegate; }
+  virtual bool IsTestImplementation() const;
+
+ private:
+  void DoIdleWork();
+
+  // Unlike other platforms, we don't control the message loop as it's
+  // controlled by the Android Looper, so we can't run a RunLoop to keep the
+  // Thread this pump belongs to alive. However, threads are expected to have an
+  // active run loop, so we manage a RunLoop internally here, starting/stopping
+  // it as necessary.
+  std::unique_ptr<RunLoop> run_loop_;
+
+  // See Abort().
+  bool should_abort_ = false;
+
+  // Whether this message pump is quitting, or has quit.
+  bool quit_ = false;
+
+  // The MessageLoop::Delegate for this pump.
+  Delegate* delegate_ = nullptr;
+
+  // The time at which we are currently scheduled to wake up and perform a
+  // delayed task.
+  base::TimeTicks delayed_scheduled_time_;
+
+  // If set, a callback to fire when the message pump is quit.
+  base::OnceClosure on_quit_callback_;
+
+  // The file descriptor used to signal that non-delayed work is available.
+  int non_delayed_fd_;
+
+  // The file descriptor used to signal that delayed work is available.
+  int delayed_fd_;
+
+  // The Android Looper for this thread.
+  ALooper* looper_ = nullptr;
+
+  DISALLOW_COPY_AND_ASSIGN(MessagePumpForUI);
+};
+
+}  // namespace base
+
+#endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_ANDROID_H_