Update input policy to handle embedded windows

ANR - If embedded windows are slow in handling inputs the system should blame the embedded app.

PointerDownOutsideFocus - if a user taps outside the currently focused window onto an
embedded window, treat it as if the host window was tapped.

Rename blessInputSurface -> grantInputChannel and add a name to embedded windows.

Bug: 134365580
Test: b WindowlessWmTest
Test: atest CtsWindowManagerDeviceTestCases:WindowlessWmTests

Change-Id: If88970cf6ce17669b41fec995535151a492fab12