Fix bug where app icon is gone for first frame on cold start.

We need the icon to be full alpha during the init pass, then when
the actual animation starts, we can swap the icon with the window
(splash screen that draws the icon).

Bug: 192366079
Test: slow down window animations
      check no empty frame on cold start app launch
      check no empty frame on warm start app launch

Change-Id: I16a1779e5252d8e88bc3c408e1dc40b264fe4cf4

quickstep/src/com/android/launcher3/QuickstepTransitionManager.java

@@ -725,7 +725,8 @@ public class QuickstepTransitionManager implements OnDeviceProfileChangeListener
                 floatingIconBounds.bottom += offsetY;
 
                 if (initOnly) {
-                    floatingView.update(mIconAlpha.value, 255, floatingIconBounds, percent, 0f,
+                    // For the init pass, we want full alpha since the window is not yet ready.
+                    floatingView.update(1f, 255, floatingIconBounds, percent, 0f,
                             mWindowRadius.value * scale, true /* isOpening */);
                     return;
                 }