Shading: Add Volume Info node.

The Volume Info node provides the Color, Desnity, Flame, and Temperature
of smoke domains.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D5551

intern/cycles/blender/blender_shader.cpp

@@ -607,6 +607,9 @@ static ShaderNode *add_node(Scene *scene,
   else if (b_node.is_a(&RNA_ShaderNodeHairInfo)) {
     node = new HairInfoNode();
   }
+  else if (b_node.is_a(&RNA_ShaderNodeVolumeInfo)) {
+    node = new VolumeInfoNode();
+  }
   else if (b_node.is_a(&RNA_ShaderNodeBump)) {
     BL::ShaderNodeBump b_bump_node(b_node);
     BumpNode *bump = new BumpNode();