implement getBufferSubDataAsync prototype

gpu/command_buffer/client/gles2_cmd_helper_autogen.h

Index: gpu/command_buffer/client/gles2_cmd_helper_autogen.h
diff --git a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
index 858707914186f8b765be4326cecc10e45e49b79d..5cb447980de189991d181431f346bcebd18bb069 100644
--- a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
+++ b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
@@ -3084,6 +3084,18 @@ void ProgramPathFragmentInputGenCHROMIUM(GLuint program,
   }
 }
 
+void GetBufferSubDataAsyncCHROMIUM(GLenum target,
+                                   GLintptr offset,
+                                   GLsizeiptr size,
+                                   uint32_t data_shm_id,
+                                   uint32_t data_shm_offset) {
+  gles2::cmds::GetBufferSubDataAsyncCHROMIUM* c =
+      GetCmdSpace<gles2::cmds::GetBufferSubDataAsyncCHROMIUM>();
+  if (c) {
+    c->Init(target, offset, size, data_shm_id, data_shm_offset);
+  }
+}
+
 void CoverageModulationCHROMIUM(GLenum components) {
   gles2::cmds::CoverageModulationCHROMIUM* c =
       GetCmdSpace<gles2::cmds::CoverageModulationCHROMIUM>();