Use provided calling uid/pid for checking intercept-global-drag flag

- This particular path can not rely on ActivityTaskManagerService's
  enforceTaskPermission() call since that uses the binder calling
  uid/pid, which has been cleared prior to calling
  validateAddingWindowLw().

Bug: 428700812
Flag: EXEMPT bugfix
Test: atest DragDropControllerTests

(cherry picked from commit 467b1858)
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:a4e4b5e6666eca22972372a665069f347758e2f0
Merged-In: I4cff5b0622624dd0c1c9f0f503a84811cb1ad877
Change-Id: I4cff5b0622624dd0c1c9f0f503a84811cb1ad877