Improve LinesYardstick design

We have shifted the responsibility of orchestrating state updates and
measurements to the yardstick. The presenter still needs to be updated to make
use of these new capabilities.

src/lines-yardstick.coffee

@@ -4,14 +4,18 @@ AcceptFilter = {acceptNode: -> NodeFilter.FILTER_ACCEPT}
 
 module.exports =
 class LinesYardstick
-  constructor: (@model, @lineNodesProvider) ->
+  constructor: (@model, @presenter, @lineNodesProvider) ->
+    @cachedPositionsByLineId = {}
     @tokenIterator = new TokenIterator
     @rangeForMeasurement = document.createRange()
-    @cachedPositionsByLineId = {}
 
   clearCache: ->
     @cachedPositionsByLineId = {}
 
+  prepareScreenRowsForMeasurement: (screenRows) ->
+    state = @presenter.getStateForMeasurements(screenRows)
+    @lineNodesProvider.updateSync(state)
+
   pixelPositionForScreenPosition: (screenPosition, clip=true) ->
     screenPosition = Point.fromObject(screenPosition)
     screenPosition = @model.clipScreenPosition(screenPosition) if clip