Send the attached frame to the client

The attached frame is the frame of the parent window that its child
attaches to, as long as the child is not
TYPE_APPLICATION_ATTACHED_DIALOG. It is a factor while computing the
window frame.

Previously, we let the child obtain the attached frame from its parent
view root. However, if the parent and the child are not in the same
process, it can be tricky.

This CL sends the attached frame from the server to the client via
ClientWindowFrames. In this way, the child can compute its window frame
without having to accessing the parent view root.

Bug: 161810301
Bug: 175861127
Test: atest ActivityRecordTests WindowLayoutTests
Change-Id: Ia844a4c927027e305a56114216eaee2bf7933b1f