Simplify logic involving BackTexture.

gpu/command_buffer/service/texture_manager.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/texture_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1680 matching lines @@
 bool Texture::EmulatingRGB() {
   return emulating_rgb_;
 }
 
 TextureRef::TextureRef(TextureManager* manager,
                        GLuint client_id,
                        Texture* texture)
     : manager_(manager),
       texture_(texture),
       client_id_(client_id),
-      num_observers_(0) {
+      num_observers_(0),
+      force_context_lost_(false) {
   DCHECK(manager_);
   DCHECK(texture_);
   texture_->AddTextureRef(this);
   manager_->StartTracking(this);
 }
 
 scoped_refptr<TextureRef> TextureRef::Create(TextureManager* manager,
                                              GLuint client_id,
                                              GLuint service_id) {
   return new TextureRef(manager, client_id, new Texture(service_id));
 }
 
 TextureRef::~TextureRef() {
   manager_->StopTracking(this);
-  texture_->RemoveTextureRef(this, manager_->have_context_);
+  texture_->RemoveTextureRef(
+      this, force_context_lost_ ? false : manager_->have_context_);
   manager_ = NULL;
 }
 
+void TextureRef::ForceContextLost() {
+  force_context_lost_ = true;
+}
+
 TextureManager::TextureManager(MemoryTracker* memory_tracker,
                                FeatureInfo* feature_info,
                                GLint max_texture_size,
                                GLint max_cube_map_texture_size,
                                GLint max_rectangle_texture_size,
                                GLint max_3d_texture_size,
                                GLint max_array_texture_layers,
                                bool use_default_textures)
     : memory_type_tracker_(new MemoryTypeTracker(memory_tracker)),
       memory_tracker_(memory_tracker),
@@ skipping 1622 matching lines @@
 uint32_t TextureManager::GetServiceIdGeneration() const {
   return current_service_id_generation_;
 }
 
 void TextureManager::IncrementServiceIdGeneration() {
   current_service_id_generation_++;
 }
 
 }  // namespace gles2
 }  // namespace gpu