gpu, cmaa: add glApplyScreenSpaceAntialiasingCHROMIUM unittests

gpu/command_buffer/service/gles2_cmd_decoder_autogen.h

Index: gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h b/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
index 8bc9253ec08ce3633c41b41ff5c7446c9528c9b4..339c2b8aaf24415ca307174e5381de0e45c74c9c 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
@@ -5483,10 +5483,6 @@ error::Error GLES2DecoderImpl::HandleBlendBarrierKHR(
 error::Error GLES2DecoderImpl::HandleApplyScreenSpaceAntialiasingCHROMIUM(
     uint32_t immediate_data_size,
     const volatile void* cmd_data) {
-  if (!features().chromium_screen_space_antialiasing) {
-    return error::kUnknownCommand;
-  }
-
   DoApplyScreenSpaceAntialiasingCHROMIUM();
   return error::kNoError;
 }