Merge changes from topic "flicker-tangor"

* changes:
  Add support for Tablets on pip tests
  Add support for Tablets on split screen tests
  Add support for Tablets on bubbles tests
  Create base test class with general assertions
  Add support for Tablets on rotation tests
  Add support for Tablets on quick switch tests
  Add support for Tablets on app launch tests
  Add support for Tablets on IME tests
  Add support for Tablets on app close tests
  Introduce common test class with general assertions