Preventing TaskSnapshotWindow crash from resized.

Create Window#mOuter in contructor, so mOuter won't have change to be
nullwhen resized.

Bug: 316720635
Test: presubmit
Test: verify no difference when create TaskSnapshotStartingWindow.
Change-Id: I5e8c4daba0879ea0a02b2f17373b2a6b205802c4
1 file changed