Save BottomSheet state when screen rotate

- Save BottomSheet state in onSaveInstanceState
- When Settings starts from saved state, we don't need to
  add fragment. Because FragmentManager already contains
  fragment instance.
- Fix status bar color

Change-Id: Ic8779b8253040554409e735bd57bd9001c1d56fd
Fixes: 112428378
Test: make RunSettingsRoboTests

src/com/android/settings/SettingsHomepageActivity.java

@@ -40,9 +40,12 @@ public class SettingsHomepageActivity extends SettingsBaseActivity {
             settings.setAction("android.settings.SETTINGS");
             startActivity(settings);
             finish();
+            return;
         }
         setContentView(R.layout.settings_homepage);
-        switchToFragment(this, R.id.main_content, HomepageFragment.class.getName());
+        if (savedInstanceState == null) {
+            switchToFragment(this, R.id.main_content, HomepageFragment.class.getName());
+        }
     }
 
     public static boolean isDynamicHomepageEnabled(Context context) {