Add GL State Restoring Functions

gpu/command_buffer/service/texture_manager.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_
 
 #include <list>
 #include <string>
 #include <vector>
@@ skipping 463 matching lines @@
   bool ClearRenderableLevels(GLES2Decoder* decoder, TextureInfo* info);
 
   // Clear a specific level.
   bool ClearTextureLevel(
       GLES2Decoder* decoder,TextureInfo* info, GLenum target, GLint level);
 
   // Creates a new texture info.
   TextureInfo* CreateTextureInfo(GLuint client_id, GLuint service_id);
 
   // Gets the texture info for the given texture.
-  TextureInfo* GetTextureInfo(GLuint client_id);
+  TextureInfo* GetTextureInfo(GLuint client_id) const;
 
   // Removes a texture info.
   void RemoveTextureInfo(GLuint client_id);
 
   // Gets a client id for a given service id.
   bool GetClientId(GLuint service_id, GLuint* client_id) const;
 
   TextureInfo* GetDefaultTextureInfo(GLenum target) {
     switch (target) {
       case GL_TEXTURE_2D:
@@ skipping 113 matching lines @@
   typedef std::list<PendingAsyncTransfer> PendingAsyncTransferList;
   PendingAsyncTransferList pending_async_transfers_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_