implement getBufferSubDataAsync prototype

gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h

Index: gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h
diff --git a/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h b/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h
index ffa607c094c8ce00eb5e145244596041dc5473ae..ce62d91502038a99a1c054568ed5507bb4319288 100644
--- a/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h
+++ b/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h
@@ -1136,6 +1136,11 @@ void GLES2InterfaceStub::ProgramPathFragmentInputGenCHROMIUM(
     GLenum /* genMode */,
     GLint /* components */,
     const GLfloat* /* coeffs */) {}
+void* GLES2InterfaceStub::GetBufferSubDataAsyncCHROMIUM(GLenum /* target */,
+                                                        GLintptr /* offset */,
+                                                        GLsizeiptr /* size */) {
+  return 0;
+}
 void GLES2InterfaceStub::CoverageModulationCHROMIUM(GLenum /* components */) {}
 GLenum GLES2InterfaceStub::GetGraphicsResetStatusKHR() {
   return 0;