Hide bubbles' IME after screenshot is taken.

Needed to create a separate receiver to handle this as GlobalScreenshot
is in the screenshot process.

Bug: 157756391
Test: Open IME in bubble test app, take screenshot, verify that IME goes
      away and does not interfere with screenshots UI.
Change-Id: I93d050340e59c5b45250f53eb943697fa543b706
2 files changed