Android: Don't destroy LayerTreeHost when Surface goes away

ui/android/resources/ui_resource_provider.h

Index: ui/android/resources/ui_resource_provider.h
diff --git a/ui/android/resources/ui_resource_provider.h b/ui/android/resources/ui_resource_provider.h
index a3b3cbcc439db6bb3d3fab28f9d6cfbf30b9d1e2..ae1b710f955af77f1832b35b5b355091cab5275c 100644
--- a/ui/android/resources/ui_resource_provider.h
+++ b/ui/android/resources/ui_resource_provider.h
@@ -17,14 +17,13 @@ namespace ui {
 
 class UIResourceClientAndroid;
 
+// TODO(sievers): Remove this class.
 class UI_ANDROID_EXPORT UIResourceProvider {
  public:
-  UIResourceProvider();
-  ~UIResourceProvider();
+  UIResourceProvider(cc::LayerTreeHost* host);
+  virtual ~UIResourceProvider();
 
-  void SetLayerTreeHost(cc::LayerTreeHost* host);
-
-  void UIResourcesAreInvalid();
+  void OnUIResourcesEvicted();
 
   virtual cc::UIResourceId CreateUIResource(
       ui::UIResourceClientAndroid* client);