Add GL State Restoring Functions

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 "base/bits.h"
 #include "base/stringprintf.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
@@ skipping 1088 matching lines @@
     ++num_unrenderable_textures_;
   }
   if (!info->SafeToRenderFrom()) {
     ++num_unsafe_textures_;
   }
   num_uncleared_mips_ += info->num_uncleared_mips();
   return info.get();
 }
 
 TextureManager::TextureInfo* TextureManager::GetTextureInfo(
-    GLuint client_id) {
-  TextureInfoMap::iterator it = texture_infos_.find(client_id);
+    GLuint client_id) const {
+  TextureInfoMap::const_iterator it = texture_infos_.find(client_id);
   return it != texture_infos_.end() ? it->second : NULL;
 }
 
 void TextureManager::RemoveTextureInfo(GLuint client_id) {
   TextureInfoMap::iterator it = texture_infos_.find(client_id);
   if (it != texture_infos_.end()) {
     TextureInfo* info = it->second;
     info->MarkAsDeleted();
     texture_infos_.erase(it);
   }
@@ skipping 124 matching lines @@
         tex_define_params.border,
         tex_define_params.format,
         tex_define_params.type,
         true); // cleared
     pending_async_transfers_.pop_front();
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu