Do not wait for transient hide transition targets

This avoids the latency to start transient transition when
the activities in the hiding tasks are slow to report drawn.

Fix: 275031340
Test: atest TransitionTests#testTransientLaunch
Change-Id: Iaaf2221150d956f509d6f9365e29da12f3243e5e

services/core/java/com/android/server/wm/ActivityRecord.java

@@ -10421,6 +10421,11 @@ final class ActivityRecord extends WindowToken implements WindowManagerService.A
 
     @Override
     boolean isSyncFinished() {
+        if (task != null && mTransitionController.isTransientHide(task)) {
+            // The activity keeps visibleRequested but may be hidden later, so no need to wait for
+            // it to be drawn.
+            return true;
+        }
         if (!super.isSyncFinished()) return false;
         if (mDisplayContent != null && mDisplayContent.mUnknownAppVisibilityController
                 .isVisibilityUnknown(this)) {

services/tests/wmtests/src/com/android/server/wm/TransitionTests.java

@@ -1415,6 +1415,8 @@ public class TransitionTests extends WindowTestsBase {
         final Transition.ChangeInfo activity1ChangeInfo = closeTransition.mChanges.get(activity1);
         assertNotNull(activity1ChangeInfo);
         assertTrue(activity1ChangeInfo.hasChanged());
+        // No need to wait for the activity in transient hide task.
+        assertTrue(activity1.isSyncFinished());
 
         activity1.setVisibleRequested(false);
         activity2.setVisibleRequested(true);