[tools][system-analyzer] Fix the color bug in Map Panel

This CL fixes the Map Panel colors. The getColor
function of Edge class was always falling to the
default color unable to show correct colors in
the timeline panel.

Change-Id: Ide13b35703a656251222f512b2b9282f9f34cc04
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2297473Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Zeynep Cankara <zcankara@google.com>
Cr-Commit-Position: refs/heads/master@{#68859}

tools/system-analyzer/map-processor.mjs

@@ -361,6 +361,8 @@ class V8Map {
 
 V8Map.cache = new Map();
 
+
+
 // ===========================================================================
 class Edge {
   constructor(type, name, reason, time, from, to) {
@@ -370,8 +372,10 @@ class Edge {
     this.time = time;
     this.from = from;
     this.to = to;
-    this.getColor = function(type){
-      switch (type) {
+  }
+
+  getColor() {
+    switch (this.type) {
       case 'new':
         // green
         return '#aedc6e';
@@ -393,7 +397,6 @@ class Edge {
     }
     // pink/violet (primary)
     return '#9B6EDC';
-    };
   }
 
   finishSetup() {
@@ -677,6 +680,9 @@ class Timeline {
   }
 }
 
+
+
+
 // ===========================================================================
 class Chunk {
   constructor(index, start, end, items, markers) {