Correctly destroy returned front buffer after resize

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 4920 matching lines @@
 void GLES2DecoderImpl::ReturnFrontBuffer(const Mailbox& mailbox, bool is_lost) {
   Texture* texture =
       static_cast<Texture*>(group_->mailbox_manager()->ConsumeTexture(mailbox));
 
   for (auto it = saved_back_textures_.begin(); it != saved_back_textures_.end();
        ++it) {
     if (texture != it->back_texture->texture_ref()->texture())
       continue;
 
     if (is_lost || it->back_texture->size() != offscreen_size_) {
-      it->back_texture->Invalidate();
+      if (is_lost)
+        it->back_texture->Invalidate();
+      else
+        it->back_texture->Destroy();
       saved_back_textures_.erase(it);
       return;
     }
 
     it->in_use = false;
     return;
   }
 
   DLOG(ERROR) << "Attempting to return a frontbuffer that was not saved.";
 }
@@ skipping 14371 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu