0466bd7957
This effect can scale Alpha values. This is needed for testing Compositor, and coincidentally was requested by a partner in the past. This also will generally be more useful in full multi-asset, where we may want to have one input have different alpha values than another Also, update fragment_shader_copy_es2.glsl to not throw away alpha values. This means ThumbnailStripShaderProgram (the only place this glsl is used) will consider input alpha and output alpha appropriately PiperOrigin-RevId: 555915092
Test data module
Provides sample data for media unit and instrumentation tests.