While working on #99421, I discovered that FlutterViewTest.java was possibly accidentally deleted at this PR: flutter/engine#44047

This bug tracks restoring the FlutterViewTest file and ensuring that the tests pass.
Path to FlutterViewTest: shell/platform/android/test/io/flutter/embedding/android/FlutterViewTest.java

Tests that need to be readded:

• itSendsTextShowPasswordToFrameworkOnAttach
• setPaddingTopToZeroForFullscreenMode
• itSendsDarkPlatformBrightnessToFlutter
• itSendsLightPlatformBrightnessToFlutter
• setPaddingTopToZeroForFullscreenModeLegacy