Android: Don't destroy LayerTreeHost when Surface goes away

ui/android/resources/ui_resource_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_ANDROID_H_
-#define UI_ANDROID_RESOURCES_UI_RESOURCE_ANDROID_H_
-
-#include "base/basictypes.h"
-#include "cc/resources/ui_resource_bitmap.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-#include "ui/android/resources/ui_resource_client_android.h"
-#include "ui/android/ui_android_export.h"
-#include "ui/gfx/android/java_bitmap.h"
-
-namespace ui {
-
-class UIResourceProvider;
-
-class UI_ANDROID_EXPORT UIResourceAndroid : public ui::UIResourceClientAndroid {
- public:
-  static scoped_ptr<UIResourceAndroid> CreateFromJavaBitmap(
-      ui::UIResourceProvider* provider,
-      const gfx::JavaBitmap& java_bitmap);
-
-  ~UIResourceAndroid() override;
-
-  // cc::UIResourceClient implementation.
-  cc::UIResourceBitmap GetBitmap(cc::UIResourceId uid,
-                                 bool resource_lost) override;
-
-  // ui::UIResourceClientAndroid implementation.
-  void UIResourceIsInvalid() override;
-
-  cc::UIResourceId id();
-
- private:
-  UIResourceAndroid(ui::UIResourceProvider* provider, const SkBitmap& skbitmap);
-
-  ui::UIResourceProvider* provider_;
-  SkBitmap bitmap_;
-  cc::UIResourceId id_;
-
-  DISALLOW_COPY_AND_ASSIGN(UIResourceAndroid);
-};
-
-}  // namespace ui
-
-#endif  // UI_ANDROID_RESOURCES_UI_RESOURCE_ANDROID_H_