Always round test duration to milliseconds

Bug: 408145209
Change-Id: I7246d08a8ff033c081a141b49ded7070f977ddd6
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6429854
Commit-Queue: Eric Leese <leese@chromium.org>
Reviewed-by: Philip Pfaffe <pfaffe@chromium.org>
Reviewed-by: Liviu Rau <liviurau@chromium.org>

Author: Eric Leese

test/conductor/karma-resultsdb-reporter.ts

@@ -67,7 +67,7 @@ export const ResultsDBReporter = function(
     const status = skipped ? 'SKIP' : success ? 'PASS' : 'FAIL';
     let duration = '.001s';
     if (startTime < endTime) {
-      duration = ((endTime - startTime) * .001).toString() + 's';
+      duration = ((endTime - startTime) * .001).toFixed(3) + 's';
     }
 
     const consoleLog = capturedLog.map(({type, log}) => `${type.toUpperCase()}: ${log}`);

test/shared/mocha-resultsdb-reporter.ts

@@ -134,7 +134,7 @@ class ResultsDbReporter extends Mocha.reporters.Spec {
     const testRetry = ((test as unknown) as TestRetry);
     const result = {
       testId: ResultsDb.sanitizedTestId(testId),
-      duration: `${(test.duration || 0) * .001}s`,
+      duration: `${((test.duration || 1) * .001).toFixed(3)}s`,
       tags: [{key: 'run', value: String(testRetry.currentRetry() + 1)}],
     };
     const hookName = this.maybeHook(test);