[Autofill Assistant] No delay for first animation.

The first animation used to be delayed, this is not necessary as there
are no previous animations to wait for.

Bug: b/158750294
Change-Id: If4260181f45be9fb9aaaea574c507600891b58c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302617Reviewed-by: Luca Hunkeler <hluca@google.com>
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Cr-Commit-Position: refs/heads/master@{#789854}

chrome/android/features/autofill_assistant/java/src/org/chromium/chrome/browser/autofill_assistant/header/AssistantStepProgressBar.java

@@ -397,9 +397,9 @@ public class AssistantStepProgressBar {
 
             if (i == step && step == mCurrentStep + 1) {
                 // In case we advance to a new step, start the enable animation on the current
-                // icon. Start the pulsating animation with a delay such that it only starts after
-                // the other animations have run.
-                mIcons[i].startPulsingAnimation(/* delayed= */ true);
+                // icon. If not for the first step, start the pulsating animation with a delay such
+                // that it only starts after the other animations have run.
+                mIcons[i].startPulsingAnimation(/* delayed= */ mCurrentStep != -1);
             } else {
                 mIcons[i].setPulsingAnimationEnabled(i == step);
             }