[turbolizer] Various cleanups

- Move helper functions to utils
- Use let/const instead of var
- Fix display bug when schedule view was initially selected

Bug: v8:7327
Notry: true
Change-Id: I7caf3dd17b725a4553d035293716f452b9999ed8
Reviewed-on: https://chromium-review.googlesource.com/c/1396088
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58550}

tools/turbolizer/src/disassembly-view.ts

@@ -7,7 +7,7 @@ import { SelectionBroker } from "../src/selection-broker"
 import { TextView } from "../src/text-view"
 import { SourceResolver } from "./source-resolver";
 import { MySelection } from "./selection";
-import { anyToString } from "./util";
+import { anyToString, interpolate } from "./util";
 import { InstructionSelectionHandler } from "./selection-handler";
 
 const toolboxHTML = `<div id="disassembly-toolbox">
@@ -292,11 +292,6 @@ export class DisassemblyView extends TextView {
     return num.toFixed(3).replace(/\.?0+$/, "") + "%";
   }
 
-  // Interpolate between the given start and end values by a fraction of val/max.
-  interpolate(val, max, start, end) {
-    return start + (end - start) * (val / max);
-  }
-
   processLine(line) {
     let view = this;
     let fragments = super.processLine(line);
@@ -326,9 +321,9 @@ export class DisassemblyView extends TextView {
                 let val = perc - PROF_COLS[i].perc;
                 let max = PROF_COLS[i + 1].perc - PROF_COLS[i].perc;
 
-                col.r = Math.round(view.interpolate(val, max, col1.r, col2.r));
-                col.g = Math.round(view.interpolate(val, max, col1.g, col2.g));
-                col.b = Math.round(view.interpolate(val, max, col1.b, col2.b));
+                col.r = Math.round(interpolate(val, max, col1.r, col2.r));
+                col.g = Math.round(interpolate(val, max, col1.g, col2.g));
+                col.b = Math.round(interpolate(val, max, col1.b, col2.b));
                 break;
               }
             }

tools/turbolizer/src/util.ts

@@ -111,7 +111,7 @@ export function isIterable(obj: any): obj is Iterable<any> {
     && typeof obj != 'string' && typeof obj[Symbol.iterator] === 'function';
 }
 
-export function alignUp(raw:number, multiple:number):number {
+export function alignUp(raw: number, multiple: number): number {
   return Math.floor((raw + multiple - 1) / multiple) * multiple;
 }
 
@@ -124,4 +124,9 @@ export function measureText(text: string) {
       height: textMeasure.getBBox().height,
     };
   }
+}
+
+// Interpolate between the given start and end values by a fraction of val/max.
+export function interpolate(val: number, max: number, start: number, end: number) {
+  return start + (end - start) * (val / max);
 }
\ No newline at end of file