Desktop examples use the deprecated mediapipe::GlCalculatorHelper::CreateSourceTexture

[Algomorph]

This is kind of between documentation and bug issue.

The Desktop examples use CreateSourceTexture. Using these, I get the warning like:

warning: ‘mediapipe::GlTexture mediapipe::GlCalculatorHelper::CreateSourceTexture(const mediapipe::ImageFrame&)’ is deprecated: Use 'GpuBufferWithImageFrame'

I haven't figured out how to use GpuBufferWithImageFrame, and I can't find it being used in tests anywhere (are GPU things even tested?).

I think update of examples demonstrating proper usage is warranted.