Android: Don't destroy LayerTreeHost when Surface goes away

chrome/browser/android/thumbnail/thumbnail.cc

Index: chrome/browser/android/thumbnail/thumbnail.cc
diff --git a/chrome/browser/android/thumbnail/thumbnail.cc b/chrome/browser/android/thumbnail/thumbnail.cc
index f4c9186e7a5c14f68e5ecf76a038ec63d2bd5e0a..ddf1dac0250efee35fcfb4ab177a152df413fb5e 100644
--- a/chrome/browser/android/thumbnail/thumbnail.cc
+++ b/chrome/browser/android/thumbnail/thumbnail.cc
@@ -55,6 +55,7 @@ Thumbnail::~Thumbnail() {
 void Thumbnail::SetBitmap(const SkBitmap& bitmap) {
   DCHECK(!bitmap.empty());
   retrieved_ = false;
+  // TODO(sievers): We really just need to invalidate it here.
   ClearUIResourceId();
   scaled_content_size_ =
       gfx::ScaleSize(gfx::Size(bitmap.width(), bitmap.height()), 1.f / scale_);
@@ -67,6 +68,7 @@ void Thumbnail::SetCompressedBitmap(skia::RefPtr<SkPixelRef> compressed_bitmap,
   DCHECK(compressed_bitmap);
   DCHECK(!content_size.IsEmpty());
   retrieved_ = false;
+  // TODO(sievers): We really just need to invalidate it here.
   ClearUIResourceId();
   gfx::Size data_size(compressed_bitmap->info().width(),
                       compressed_bitmap->info().height());
@@ -94,8 +96,7 @@ cc::UIResourceBitmap Thumbnail::GetBitmap(cc::UIResourceId uid,
   return old_bitmap;
 }
 
-void Thumbnail::UIResourceIsInvalid() {
-  ui_resource_id_ = 0;
+void Thumbnail::OnWasEvicted() {
   if (thumbnail_delegate_)
     thumbnail_delegate_->InvalidateCachedThumbnail(this);
 }