Update rbx_dom dependencies (#768)

plugin/rbx_dom_lua/customProperties.lua

@@ -1,5 +1,30 @@
 local CollectionService = game:GetService("CollectionService")
 
+--- A list of `Enum.Material` values that are used for Terrain.MaterialColors
+local TERRAIN_MATERIAL_COLORS = {
+	Enum.Material.Grass,
+	Enum.Material.Slate,
+	Enum.Material.Concrete,
+	Enum.Material.Brick,
+	Enum.Material.Sand,
+	Enum.Material.WoodPlanks,
+	Enum.Material.Rock,
+	Enum.Material.Glacier,
+	Enum.Material.Snow,
+	Enum.Material.Sandstone,
+	Enum.Material.Mud,
+	Enum.Material.Basalt,
+	Enum.Material.Ground,
+	Enum.Material.CrackedLava,
+	Enum.Material.Asphalt,
+	Enum.Material.Cobblestone,
+	Enum.Material.Ice,
+	Enum.Material.LeafyGrass,
+	Enum.Material.Salt,
+	Enum.Material.Limestone,
+	Enum.Material.Pavement,
+}
+
 -- Defines how to read and write properties that aren't directly scriptable.
 --
 -- The reflection database refers to these as having scriptability = "Custom"
@@ -71,4 +96,24 @@ return {
 			end,
 		},
 	},
+	Terrain = {
+		MaterialColors = {
+			read = function(instance: Terrain)
+				-- There's no way to get a list of every color, so we have to
+				-- make one.
+				local colors = {}
+				for _, material in TERRAIN_MATERIAL_COLORS do
+					colors[material] = instance:GetMaterialColor(material)
+				end
+
+				return true, colors
+			end,
+			write = function(instance: Terrain, _, value: { [Enum.Material]: Color3 })
+				for material, color in value do
+					instance:SetMaterialColor(material, color)
+				end
+				return true
+			end,
+		},
+	},
 }