[profview] Add runtime-entry top-down tree.

tools/profview/profview.js

 // Copyright 2017 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 "use strict"
 
 function $(id) {
   return document.getElementById(id);
 }
 
@@ skipping 508 matching lines @@
             { value : "none", text : "None" }
         ], calltree.categories);
         addOptions(this.selectSort, [
             { value : "time", text : "Time (including children)" },
             { value : "category-time", text : "Code category, time" },
         ], calltree.sort);
         return;
       case "top-down":
         addOptions(this.selectAttribution, attributions, calltree.attribution);
         addOptions(this.selectCategories, [
-            { value : "none", text : "None" }
+            { value : "none", text : "None" },
+            { value : "rt-entry", text : "Runtime entries" }
         ], calltree.categories);
         addOptions(this.selectSort, [
             { value : "time", text : "Time (including children)" },
             { value : "own-time", text : "Own time" },
             { value : "category-time", text : "Code category, time" },
             { value : "category-own-time", text : "Code category, own time"}
         ], calltree.sort);
         return;
       case "function-list":
         addOptions(this.selectAttribution, attributions, calltree.attribution);
@@ skipping 58 matching lines @@
     let ownTimeClass = (mode === "bottom-up") ? "numeric-hidden" : "numeric";
     let ownTimeTh = $(this.treeElement.id + "-own-time-header");
     ownTimeTh.classList = ownTimeClass;
     let ownTicksTh = $(this.treeElement.id + "-own-ticks-header");
     ownTicksTh.classList = ownTimeClass;
 
     // Build the tree.
     let stackProcessor;
     let filter = filterFromFilterId(this.currentState.callTree.attribution);
     if (mode === "top-down") {
-      stackProcessor =
-          new PlainCallTreeProcessor(filter, false);
+      if (this.currentState.callTree.categories === "rt-entry") {
+        stackProcessor =
+            new RuntimeCallTreeProcessor();
+      } else {
+        stackProcessor =
+            new PlainCallTreeProcessor(filter, false);
+      }
     } else if (mode === "function-list") {
       stackProcessor = new FunctionListTree(
           filter, this.currentState.callTree.categories === "code-type");
 
     } else {
       console.assert(mode === "bottom-up");
       if (this.currentState.callTree.categories == "none") {
         stackProcessor =
             new PlainCallTreeProcessor(filter, true);
       } else {
@@ skipping 605 matching lines @@
 
 class HelpView {
   constructor() {
     this.element = $("help");
   }
 
   render(newState) {
     this.element.style.display = newState.file ? "none" : "inherit";
   }
 }