implement getBufferSubDataAsync prototype

gpu/command_buffer/client/gles2_c_lib_autogen.h

 // Copyright 2014 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
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 1646 matching lines @@
 }
 void GL_APIENTRY
 GLES2ProgramPathFragmentInputGenCHROMIUM(GLuint program,
                                          GLint location,
                                          GLenum genMode,
                                          GLint components,
                                          const GLfloat* coeffs) {
   gles2::GetGLContext()->ProgramPathFragmentInputGenCHROMIUM(
       program, location, genMode, components, coeffs);
 }
+void* GL_APIENTRY GLES2GetBufferSubDataAsyncCHROMIUM(GLenum target,
+                                                     GLintptr offset,
+                                                     GLsizeiptr size) {
+  return gles2::GetGLContext()->GetBufferSubDataAsyncCHROMIUM(target, offset,
+                                                              size);
+}
 void GL_APIENTRY GLES2CoverageModulationCHROMIUM(GLenum components) {
   gles2::GetGLContext()->CoverageModulationCHROMIUM(components);
 }
 GLenum GL_APIENTRY GLES2GetGraphicsResetStatusKHR() {
   return gles2::GetGLContext()->GetGraphicsResetStatusKHR();
 }
 void GL_APIENTRY GLES2BlendBarrierKHR() {
   gles2::GetGLContext()->BlendBarrierKHR();
 }
 void GL_APIENTRY GLES2ApplyScreenSpaceAntialiasingCHROMIUM() {
@@ skipping 1277 matching lines @@
         "glBindFragmentInputLocationCHROMIUM",
         reinterpret_cast<GLES2FunctionPointer>(
             glBindFragmentInputLocationCHROMIUM),
     },
     {
         "glProgramPathFragmentInputGenCHROMIUM",
         reinterpret_cast<GLES2FunctionPointer>(
             glProgramPathFragmentInputGenCHROMIUM),
     },
     {
+        "glGetBufferSubDataAsyncCHROMIUM",
+        reinterpret_cast<GLES2FunctionPointer>(glGetBufferSubDataAsyncCHROMIUM),
+    },
+    {
         "glCoverageModulationCHROMIUM",
         reinterpret_cast<GLES2FunctionPointer>(glCoverageModulationCHROMIUM),
     },
     {
         "glGetGraphicsResetStatusKHR",
         reinterpret_cast<GLES2FunctionPointer>(glGetGraphicsResetStatusKHR),
     },
     {
         "glBlendBarrierKHR",
         reinterpret_cast<GLES2FunctionPointer>(glBlendBarrierKHR),
@@ skipping 25 matching lines @@
         "glSwapBuffersWithDamageCHROMIUM",
         reinterpret_cast<GLES2FunctionPointer>(glSwapBuffersWithDamageCHROMIUM),
     },
     {
         NULL, NULL,
     },
 };
 
 }  // namespace gles2
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_C_LIB_AUTOGEN_H_