Fix system toolbar doesn't use correct theme.

The toolbar should set the theme to the app's theme. Because the
service cannot get the application context, we should pass this
information from application to service.

Bug: 218833400
Test: manual. Use light/dark theme for app, the toolbar shows with
the same theme
Test: atest TextViewIntegrationTest
Test: atest android.widget.TextViewActivityTest

Change-Id: I6d4e4e117c680ce57e760a87987059eded09b2bc