b033b5a431
1. When moveActivityToPinnedRootTask with creating a new Task for PiP, make sure the Task's initial bounds is the same as the activity parent TaskFragment so the animation starts from the correct bounds. 2. When exit PiP to previous Task, make sure we are animating the correct window surface. For the previous implementation. there can also be TRANSIT_CHANGE change for entering ActivityEmbedding split (from PiP) in the same transition. Bug: 207070762 Test: atest WmTests:RootWindowContainerTests Test: atest WmTests:TransitionTests Change-Id: Ifba090ad9ac9fb7033d343eab1c87c1a67bb9c11