add basic mock for treemap and sunburst - rename a variable name

Author: archmoj

src/traces/treemap/plot.js

@@ -156,7 +156,7 @@ function plotOne(gd, cd, element, transitionOpts) {
     trace._maxDepth = maxDepth;
     trace._backgroundColor = fullLayout.paper_bgcolor;
     trace._entryDepth = entry.data.depth;
-    trace._atMultipleRoot = isRoot;
+    trace._atRootLevel = isRoot;
 
     var cenX = -vpw / 2 + gs.l + gs.w * (domain.x[1] + domain.x[0]) / 2;
     var cenY = -vph / 2 + gs.t + gs.h * (1 - (domain.y[1] + domain.y[0]) / 2);

src/traces/treemap/style.js

@@ -68,7 +68,7 @@ function styleOne(s, pt, trace, opts) {
                         }
                     } else { // i.e. case of depthfade === 'reversed'
                         n = pt.data.depth - trace._entryDepth;
-                        if(!trace._atMultipleRoot) n++;
+                        if(!trace._atRootLevel) n++;
                     }
 
                     if(n > 0) {