Android: Don't destroy LayerTreeHost when Surface goes away

chrome/browser/android/thumbnail/thumbnail_cache.h

Index: chrome/browser/android/thumbnail/thumbnail_cache.h
diff --git a/chrome/browser/android/thumbnail/thumbnail_cache.h b/chrome/browser/android/thumbnail/thumbnail_cache.h
index 0ab16b4dda9829535b8375bdd1242dbef351fc9c..41de14155205092c547d65c145d89c1fc2fb3f21 100644
--- a/chrome/browser/android/thumbnail/thumbnail_cache.h
+++ b/chrome/browser/android/thumbnail/thumbnail_cache.h
@@ -18,7 +18,6 @@
 #include "chrome/browser/android/thumbnail/scoped_ptr_expiring_cache.h"
 #include "chrome/browser/android/thumbnail/thumbnail.h"
 #include "third_party/skia/include/core/SkBitmap.h"
-#include "ui/android/resources/ui_resource_client_android.h"
 #include "ui/android/resources/ui_resource_provider.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/size.h"
@@ -70,6 +69,10 @@ class ThumbnailCache : ThumbnailDelegate {
       const base::Callback<void(bool, SkBitmap)>&
           post_decompress_callback);
 
+  // Called when resident textures were evicted, which requires paging
+  // in bitmaps.
+  void OnUIResourcesWereEvicted();
+
   // ThumbnailDelegate implementation
   void InvalidateCachedThumbnail(Thumbnail* thumbnail) override;
   static base::FilePath GetCacheDirectory();