[RESTRICT AUTOMERGE] Fix the test flakiness on testCrossDisplayBasicImeOperations

Use View#getLocationOnScreen to reflect the editor's position on the virtual
display in case View#getDrawingRect might return (0, 0) that makes the test
failure when verifying touching editor focus state.

Fix: 185952821
Test: atest MultiDisplaySystemDecorationTests#\
      testCrossDisplayBasicImeOperations
Merged-In: Ic641226e7ccdf8fc1ebbc8c01710d308a8417fc1
Change-Id: Ic641226e7ccdf8fc1ebbc8c01710d308a8417fc1
1 file changed