Android: Don't destroy LayerTreeHost when Surface goes away

chrome/browser/android/thumbnail/thumbnail_cache.cc

Index: chrome/browser/android/thumbnail/thumbnail_cache.cc
diff --git a/chrome/browser/android/thumbnail/thumbnail_cache.cc b/chrome/browser/android/thumbnail/thumbnail_cache.cc
index ca6751592eca8c9d96853fa851f1b9d0a11c7cb6..381bbc32ab1dfa7f1aea8bf909feec61f561edbc 100644
--- a/chrome/browser/android/thumbnail/thumbnail_cache.cc
+++ b/chrome/browser/android/thumbnail/thumbnail_cache.cc
@@ -473,6 +473,11 @@ void ThumbnailCache::RemoveFromReadQueue(TabId tab_id) {
     read_queue_.erase(read_iter);
 }
 
+void ThumbnailCache::OnUIResourcesWereEvicted() {
+  cache_.Clear();
+  approximation_cache_.Clear();
+}
+
 void ThumbnailCache::InvalidateCachedThumbnail(Thumbnail* thumbnail) {
   DCHECK(thumbnail);
   TabId tab_id = thumbnail->tab_id();