Drag tasks from center when perfoming dismiss cancel for tests.

Follow up to Change-Id: I14f3012973ddee0d850db5de284a0efde6122d2c

Fix: 412766455
Test: TaplTestsQuickstep#dismissCancel
Flag: EXEMPT bugfix.
Change-Id: Idcf17fe810a935c325d043519d2b8d216b3f5c13

quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java

@@ -526,7 +526,7 @@ public class TaplTestsQuickstep extends AbstractQuickStepTest {
 
     @Test
     @PortraitLandscape
-    @ScreenRecordRule.ScreenRecord // TODO(b/396447643): Remove screen record.
+    @ScreenRecordRule.ScreenRecord // TODO(b/412766455): Remove screen record.
     public void testDismissCancel() throws Exception {
         startTestAppsWithCheck();
         Overview overview = mLauncher.goHome().switchToOverview();

tests/tapl/com/android/launcher3/tapl/OverviewTask.java

@@ -214,7 +214,7 @@ public final class OverviewTask {
 
             final Rect taskBounds = mLauncher.getVisibleBounds(mTask);
             final int centerX = taskBounds.centerX();
-            final int centerY = taskBounds.bottom - 1;
+            final int centerY = taskBounds.centerY();
             final int endCenterY = centerY - (taskBounds.height() / 4);
             mLauncher.executeAndWaitForLauncherEvent(
                     // Set slowDown to true so we do not fling the task at the end of the drag, as