Move all logic of navigation bar to NavigationBarController(2/N)

Since we don't have status bar on external displays, we need to saparate
the logic to make some animations or transitions just work on external
navigation bars. When we set System UI visibility on an external display,
we could make the flag only effect navigation bar. Also, it can simplify
StatusBar code by moving navigation bar related fields into
NavigationBarController.

Test: atest SystemUITests
Bug: 117478341

Change-Id: I1cdf61f6eeb2c377e04a073401efa0cdb45b65cd
diff --git a/packages/SystemUI/tests/src/com/android/systemui/ScreenDecorationsTest.java b/packages/SystemUI/tests/src/com/android/systemui/ScreenDecorationsTest.java
index b84f85b..122b094 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/ScreenDecorationsTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/ScreenDecorationsTest.java
@@ -16,13 +16,13 @@
 
 import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_IS_ROUNDED_CORNERS_OVERLAY;
 
-import  static com.android.systemui.ScreenDecorations.rectsToRegion;
+import static com.android.systemui.ScreenDecorations.rectsToRegion;
 import static com.android.systemui.tuner.TunablePadding.FLAG_END;
 import static com.android.systemui.tuner.TunablePadding.FLAG_START;
 
 import static org.hamcrest.Matchers.is;
-import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.anyString;
@@ -87,7 +87,6 @@
         mWindowManager = mock(WindowManager.class);
         mView = spy(new StatusBarWindowView(mContext, null));
         when(mStatusBar.getStatusBarWindow()).thenReturn(mView);
-        when(mStatusBar.getNavigationBarWindow()).thenReturn(mView);
         mContext.putComponent(StatusBar.class, mStatusBar);
 
         Display display = mContext.getSystemService(WindowManager.class).getDefaultDisplay();