Test Failure: 'u_normalTextureScale' : undeclared identifier

[ggetz]

I'm seeing the following from running unit tests locally. @jjhembd Is this related to the latest material updates?

 RuntimeError: Fragment shader failed to compile.  Compile log: ERROR: 0:586: 'u_normalTextureScale' : undeclared identifier

error properties: undefined: undefined
Error
    at RuntimeError [as constructor] (packages/engine/Source/Core/RuntimeError.js:38:11 <- Build/CesiumUnminified/Cesium.js:12755:13)
    at createAndLinkProgram (packages/engine/Source/Renderer/ShaderProgram.js:266:9 <- Build/CesiumUnminified/Cesium.js:28323:11)
    at reinitialize (packages/engine/Source/Renderer/ShaderProgram.js:470:19 <- Build/CesiumUnminified/Cesium.js:28476:21)
    at initialize2 (packages/engine/Source/Renderer/ShaderProgram.js:463:3 <- Build/CesiumUnminified/Cesium.js:28471:5)
    at ShaderProgram._bind (packages/engine/Source/Renderer/ShaderProgram.js:542:3 <- Build/CesiumUnminified/Cesium.js:28530:5)
    at beginDraw (packages/engine/Source/Renderer/Context.js:1295:17 <- Build/CesiumUnminified/Cesium.js:36936:19)
    at Context.draw (packages/engine/Source/Renderer/Context.js:1409:3 <- Build/CesiumUnminified/Cesium.js:37030:5)
    at DrawCommand.execute (packages/engine/Source/Renderer/DrawCommand.js:608:11 <- Build/CesiumUnminified/Cesium.js:25495:13)
    at executeCommand (packages/engine/Source/Scene/Scene.js:2211:13 <- Build/CesiumUnminified/Cesium.js:221657:15)
    at executeCommands2 (packages/engine/Source/Scene/Scene.js:2661:7 <- Build/CesiumUnminified/Cesium.js:221959:9)