Merge "Update params doc" into sc-dev

// matrix transforming from linear XYZ to linear RGB immediately before OETF.

// We also provide additional HDR metadata upon creating the shader:

// * The max display luminance is the max luminance of the physical display in nits

// * The max mastering luminance is provided as the max luminance from the SMPTE 2086

// standard.

// * The max content luminance is provided as the max light level from the CTA 861.3

// standard.

// * The max luminance is provided as the max luminance for the buffer, either from the SMPTE 2086

// or as the max light level from the CTA 861.3 standard.

sk_sp<SkShader> createLinearEffectShader(sk_sp<SkShader> inputShader,

                                         const LinearEffect& linearEffect,

                                         sk_sp<SkRuntimeEffect> runtimeEffect,