tree 62bfcffbc1b33e49a7b3bfc4a7cc17001e383642
parent 01d6688ed499d2f81ffced29eb6855f94d34e22e
author Vadim Tryshev <vadimt@google.com> 1439512521 -0700
committer Vadim Tryshev <vadimt@google.com> 1439592183 -0700

Bullet-proofing the drag window initial animation.

It’s unlikely, but still possible that something interesting will happen
during the 150 ms that DragWindows takes to slightly increase in size
before it gets hidden and replaced by the framework DND drag shadow.

This fix covers 2 possible events that can happen during that time:
1. The drag gets cancelled (for example because of an app uninstall).
Here, we eliminate a crash.
2. The user starts dragging the shadow. Before, this would start
scrolling the home page. Now, SystemDragDriver starts processing touch
events exactly as the InternalDragDriver would, until the growing
finishes. Afterwards, it switches to framework dragging.

Bug: 22609426
Change-Id: I73cc09fea45fcdcc6b75b13be1347da3e7c95509