Android: Don't destroy LayerTreeHost when Surface goes away

ui/android/resources/ui_resource_client_android.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 UI_ANDROID_RESOURCES_UI_RESOURCE_CLIENT_ANDROID_H_
-#define UI_ANDROID_RESOURCES_UI_RESOURCE_CLIENT_ANDROID_H_
-
-#include "cc/resources/ui_resource_client.h"
-#include "ui/android/ui_android_export.h"
-
-namespace ui {
-
-// Android's UIResourceClient has one extra callback (UIResourceIsInvalid).
-// This signal is intended for the case when the LayerTreeHost is cleared and
-// the user needs to recreate their resources.
-// TODO(powei): This interface can be removed once crbug.com/374906 has been
-// addressed.
-class UI_ANDROID_EXPORT UIResourceClientAndroid : public cc::UIResourceClient {
- public:
-  // This method indicates that the UI resource the user holds is no longer
-  // valid. The user should not call DeleteUIResource on any resource generated
-  // before this signal.
-  virtual void UIResourceIsInvalid() = 0;
-};
-
-}  // namespace ui
-
-#endif  // UI_ANDROID_RESOURCES_UI_RESOURCE_CLIENT_ANDROID_H_