Perform glReadPixels with PBOs in the gpu, if PBOs are available.

gpu/command_buffer/client/gles2_cmd_helper_autogen.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 is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // DO NOT EDIT!
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_GLES2_CMD_HELPER_AUTOGEN_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GLES2_CMD_HELPER_AUTOGEN_H_
@@ skipping 905 matching lines @@
   void PolygonOffset(GLfloat factor, GLfloat units) {
     gles2::cmds::PolygonOffset* c = GetCmdSpace<gles2::cmds::PolygonOffset>();
     if (c) {
       c->Init(factor, units);
     }
   }
 
   void ReadPixels(
       GLint x, GLint y, GLsizei width, GLsizei height, GLenum format,
       GLenum type, uint32 pixels_shm_id, uint32 pixels_shm_offset,
-      uint32 result_shm_id, uint32 result_shm_offset) {
+      uint32 result_shm_id, uint32 result_shm_offset, GLboolean async) {
     gles2::cmds::ReadPixels* c = GetCmdSpace<gles2::cmds::ReadPixels>();
     if (c) {
       c->Init(
           x, y, width, height, format, type, pixels_shm_id, pixels_shm_offset,
-          result_shm_id, result_shm_offset);
+          result_shm_id, result_shm_offset, async);
     }
   }
 
   void ReleaseShaderCompiler() {
     gles2::cmds::ReleaseShaderCompiler* c =
         GetCmdSpace<gles2::cmds::ReleaseShaderCompiler>();
     if (c) {
       c->Init();
     }
   }
@@ skipping 1153 matching lines @@
     gles2::cmds::DrawBuffersEXTImmediate* c =
         GetImmediateCmdSpaceTotalSize<gles2::cmds::DrawBuffersEXTImmediate>(
             size);
     if (c) {
       c->Init(count, bufs);
     }
   }
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_CMD_HELPER_AUTOGEN_H_