fix T40375 Glossy shader bakes different than render
fix T40375 Glossy shader bakes different than render

Comments from Brecht Van Lommel:
"""
Currently the viewing direction for each pixel is set to the normal, so
at every pixel glossy is evaluated as if you're looking straight at it.
Blender Internal works the same.
"""

This patch makes baking glossy as viewed from the camera.

Reviewers: brecht

CC: zanqdo

Differential Revision: https://developer.blender.org/D555

pyrochlore/cycles,tangent-opensource/coreBlackbird,tangent-opensource/coreBlackbird,pyrochlore/cycles,tangent-opensource/coreBlackbird,pyrochlore/cycles