The Realistic shadow ramp doesn't match the look of Standard Lite, Diffuse, etc. shaders.

The images contain two spheres, the upper one with Toon Standard, and the lower one with Standard Lite with Android platform selected.

The first image shows how the current Realistic shadow ramp looks.

The second image shows how the Realistic shadow ramp looks with the texture (that comes with SDK) marked as sRGB. It's getting closer, but still wrong. Also, obviously this won't affect the shader on actual clients.

The third image shows a correct shadow ramp texture that produces pretty much an identical result (not perfect probably due to differences in indirect lighting between shaders). The texture is also attached.

As a workaround for now, the correct texture can be used with Custom ramp mode, just make sure to set texture's "Wrap Mode" to "Clamp", mark as sRGB, and use RGB 24 bit format.