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 ac6ad38732406caa9736898e49b06acfbee90d0a..88494d232b9fc559e40e139a4a242587b3a9eb1f 100644
--- a/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h
+++ b/gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h
@@ -1133,6 +1133,11 @@ 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;