Bring back histogram colorscale

src/traces/histogram/calc.js

@@ -14,6 +14,7 @@ var isNumeric = require('fast-isnumeric');
 var Lib = require('../../lib');
 var Axes = require('../../plots/cartesian/axes');
 
+var arraysToCalcdata = require('../bar/arrays_to_calcdata');
 var binFunctions = require('./bin_functions');
 var normFunctions = require('./norm_functions');
 var doAvg = require('./average');
@@ -168,6 +169,8 @@ module.exports = function calc(gd, trace) {
         }
     }
 
+    arraysToCalcdata(cd, trace);
+
     return cd;
 };
 

test/image/mocks/histogram_colorscale.json

@@ -0,0 +1,23 @@
+{
+    "data": [
+        {
+            "xbins": {
+                "start": -1.5,
+                "end": 4.5,
+                "size": 1
+            },
+            "marker": {
+                "cmin": 0,
+                "colorscale": "Earth",
+                "color": [ 0, 1, 2, 3, 4, 5 ],
+                "cmax": 5
+            },
+            "x": [ 0, 1, 1, 2, 2, 2, 3, 3, 4 ],
+            "type": "histogram"
+        }
+    ],
+    "layout": {
+        "height": 500,
+        "width": 700
+    }
+}