Move mLastInputSource member to TextView from Editor

The ActionMode could be initiated from LinkMovementMethod
which can be handled without Editor instance. So, moving
mLastInputSource member from Editor to TextView.

Test: TextViewIntegrationTest TextViewMouseInteractionTest
Bug: 243922672
Change-Id: I05679f8dbd30fd69e11ed4e315b5b309647ecafb
3 files changed