Android: Don't destroy LayerTreeHost when Surface goes away

ui/android/resources/ui_resource_client_android.h

Index: ui/android/resources/ui_resource_client_android.h
diff --git a/ui/android/resources/ui_resource_client_android.h b/ui/android/resources/ui_resource_client_android.h
index 4ada671fa6231b52dea1222c4d1eb749764e9dd7..5de7a885214fb519bdfb1363843e0e659f29d21e 100644
--- a/ui/android/resources/ui_resource_client_android.h
+++ b/ui/android/resources/ui_resource_client_android.h
@@ -10,17 +10,13 @@
 
 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.
+// TODO(sievers): This interface should be removed. But it requires Thumbnail
+// to manage its bitmap paging differently.
 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;
+  // This method indicates that the UI resource the user holds was evicted.
+  // DEPRECATED.
+  virtual void OnWasEvicted() {}
 };
 
 }  // namespace ui