Fix janky in transition doze -> lockscreen

Also fix some unnecessary layer creation for dismiss button.

Bug: 18238168
Change-Id: I71989f2a24162e4453781c07e50d6c25fb380089

packages/SystemUI/src/com/android/systemui/statusbar/DismissViewImageButton.java

@@ -61,4 +61,9 @@ public class DismissViewImageButton extends ImageButton {
         outRect.top += translationY;
         outRect.bottom += translationY;
     }
+
+    @Override
+    public boolean hasOverlappingRendering() {
+        return false;
+    }
 }

packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

@@ -3071,8 +3071,6 @@ public class PhoneStatusBar extends BaseStatusBar implements DemoMode,
             }
             else if (Intent.ACTION_SCREEN_ON.equals(action)) {
                 mScreenOn = true;
-                // work around problem where mDisplay.getRotation() is not stable while screen is off (bug 7086018)
-                repositionNavigationBar();
                 notifyNavigationBarScreenOn(true);
             }
             else if (ACTION_DEMO.equals(action)) {