Android: Don't destroy LayerTreeHost when Surface goes away

chrome/browser/android/compositor/tab_content_manager.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 CHROME_BROWSER_ANDROID_COMPOSITOR_TAB_CONTENT_MANAGER_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_TAB_CONTENT_MANAGER_H_
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
@@ skipping 30 matching lines @@
                     jint default_cache_size,
                     jint approximation_cache_size,
                     jint compression_queue_max_size,
                     jint write_queue_max_size,
                     jboolean use_approximation_thumbnail);
 
   virtual ~TabContentManager();
 
   void Destroy(JNIEnv* env, jobject obj);
 
-  void SetUIResourceProvider(JNIEnv* env,
-                             jobject obj,
-                             jlong ui_resource_provider_ptr);
   void SetUIResourceProvider(ui::UIResourceProvider* ui_resource_provider);
 
   // Get the live layer from the cache.
   scoped_refptr<cc::Layer> GetLiveLayer(int tab_id);
 
   // Get the static thumbnail from the cache, or the NTP.
   scoped_refptr<ThumbnailLayer> GetStaticLayer(int tab_id,
                                                bool force_disk_read);
 
   // Should be called when a tab gets a new live layer that should be served
@@ skipping 19 matching lines @@
                           jobject tab,
                           jobject bitmap,
                           jfloat thumbnail_scale);
   void InvalidateIfChanged(JNIEnv* env, jobject obj, jint tab_id, jstring jurl);
   void UpdateVisibleIds(JNIEnv* env, jobject obj, jintArray priority);
   void RemoveTabThumbnail(JNIEnv* env, jobject obj, jint tab_id);
   void RemoveTabThumbnailFromDiskAtAndAboveId(JNIEnv* env,
                                               jobject obj,
                                               jint min_forbidden_id);
   void GetDecompressedThumbnail(JNIEnv* env, jobject obj, jint tab_id);
+  void OnUIResourcesWereEvicted();
 
   // ThumbnailCacheObserver implementation;
   void OnFinishedThumbnailRead(TabId tab_id) override;
 
  private:
   class TabReadbackRequest;
   typedef base::hash_map<int, scoped_refptr<cc::Layer>> LayerMap;
   typedef base::hash_map<int, scoped_refptr<ThumbnailLayer>> ThumbnailLayerMap;
   typedef base::ScopedPtrHashMap<int, scoped_ptr<TabReadbackRequest>>
       TabReadbackRequestMap;
@@ skipping 12 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(TabContentManager);
 };
 
 bool RegisterTabContentManager(JNIEnv* env);
 
 }  // namespace android
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_TAB_CONTENT_MANAGER_H_