[Search] Add start delay to scrim animation during SearchBar to SearchView expand to reduce visual noise

PiperOrigin-RevId: 623875803

Author: dsn5ft

lib/java/com/google/android/material/search/SearchViewAnimationHelper.java

@@ -68,6 +68,7 @@ class SearchViewAnimationHelper {
   private static final long SHOW_CONTENT_ALPHA_DURATION_MS = 150;
   private static final long SHOW_CONTENT_ALPHA_START_DELAY_MS = 75;
   private static final long SHOW_CONTENT_SCALE_DURATION_MS = SHOW_DURATION_MS;
+  private static final long SHOW_SCRIM_ALPHA_DURATION_MS = 100;
 
   // Constants for hide collapse animation
   private static final long HIDE_DURATION_MS = 250;
@@ -328,6 +329,7 @@ private Animator getScrimAlphaAnimator(boolean show) {
 
     ValueAnimator animator = ValueAnimator.ofFloat(0, 1);
     animator.setDuration(show ? SHOW_DURATION_MS : HIDE_DURATION_MS);
+    animator.setStartDelay(show ? SHOW_SCRIM_ALPHA_DURATION_MS : 0);
     animator.setInterpolator(ReversableAnimatedValueInterpolator.of(show, interpolator));
     animator.addUpdateListener(MultiViewUpdateListener.alphaListener(scrim));
     return animator;