content_shell: Move BrowserTestSystemMessageHandler and use it in layout tests for Android

content/test/browser_test_message_pump_android.h

-// Copyright (c) 2013 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 CONTENT_TEST_BROWSER_TEST_MESSAGE_PUMP_ANDROID_
-#define CONTENT_TEST_BROWSER_TEST_MESSAGE_PUMP_ANDROID_
-
-#include "base/android/jni_android.h"
-#include "base/compiler_specific.h"
-#include "base/message_pump_android.h"
-
-namespace content {
-
-// MessgePump to be used for content browsertests on Android.
-// This overrides the default ui message pump to allow nested loops.
-class BrowserTestMessagePumpAndroid : public base::MessagePumpForUI {
- public:
-  BrowserTestMessagePumpAndroid();
-
-  virtual void Run(Delegate* delegate) OVERRIDE;
-  virtual void Quit() OVERRIDE;
-  virtual void ScheduleWork() OVERRIDE;
-  virtual void ScheduleDelayedWork(
-      const base::TimeTicks& delayed_work_time) OVERRIDE;
-  virtual void Start(Delegate* delegate) OVERRIDE;
-
-  static bool RegisterJni(JNIEnv* env);
-
- protected:
-  virtual ~BrowserTestMessagePumpAndroid();
-
- private:
-  // We may make recursive calls to Run, so we save state that needs to be
-  // separate between them in this structure type.
-  struct RunState;
-
-  RunState* state_;
-
-  DISALLOW_COPY_AND_ASSIGN(BrowserTestMessagePumpAndroid);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_TEST_BROWSER_TEST_MESSAGE_PUMP_ANDROID_