gpu: Add async upload functions.

gpu/command_buffer/service/gl_utils.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.
 
 // This file includes all the necessary GL headers and implements some useful
 // utilities.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_
 
@@ skipping 74 matching lines @@
 
 // GL_CHROMIUM_command_buffer_query
 #define GL_COMMANDS_ISSUED_CHROMIUM            0x84F2
 
 /* GL_CHROMIUM_get_error_query */
 #define GL_GET_ERROR_QUERY_CHROMIUM            0x84F3
 
 /* GL_CHROMIUM_command_buffer_latency_query */
 #define GL_LATENCY_QUERY_CHROMIUM              0x84F4
 
+/* GL_CHROMIUM_async_pixel_transfers */
+#define GL_ASYNC_PIXEL_TRANSFERS_COMPLETED_CHROMIUM      0x84F5
+
 // GL_OES_texure_3D
 #define GL_SAMPLER_3D_OES                      0x8B5F
 
 // GL_OES_depth24
 #define GL_DEPTH_COMPONENT24_OES               0x81A6
 
 // GL_OES_depth32
 #define GL_DEPTH_COMPONENT32_OES               0x81A7
 
 // GL_OES_packed_depth_stencil
@@ skipping 23 matching lines @@
 #ifdef GL_ERROR_DEBUGGING
 #define CHECK_GL_ERROR() do {                                           \
     GLenum gl_error = glGetError();                                     \
     LOG_IF(ERROR, gl_error != GL_NO_ERROR) << "GL Error :" << gl_error; \
   } while (0)
 #else  // GL_ERROR_DEBUGGING
 #define CHECK_GL_ERROR() void(0)
 #endif  // GL_ERROR_DEBUGGING
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_