Invalidate the Recents list but don't reload the view immediately when
PiP is dismissed. This effectively reverts commit
If593c2e7271e972e96b1ab21b4396af66b1e3ea4.
Bug: 416666696
Test: m
Test: Presubmits
Test: Manual - enter PiP, then swipe up to Overview. Dismiss PiP and
verify the list is not updated. Exit Overview and re-enter Overview.
Verify that the list is updated with the previously PiP-ed task.
Flag: EXEMPT bug fix
Change-Id: Iaa832f3b4e42404a7469b6b53a379ef42d959442
Merissa Mitchell
98f0937787