commit 1864a509b06ab2e3e7de25d38776f03aca5e865e
author louis_chang <louis_chang@htc.com> Tue Dec 02 12:38:05 2014 +0800
committer Craig Mautner <cmautner@google.com> Thu Dec 04 13:35:02 2014 -0800
tree a3b9887a5875a7715448fe668d94fb32dc812065
parent 932c33214729fe2d2b09f82ef60a72871f182654

[ActivityManager] Invalidate last screenshot when activity relaunched

Symptom:
The task thumbnail is not updated when activity relaunched.

Reproduce Steps:
1. Put device in portrait
2. Launch Calculator
3. Launch Recent App (the Calculator's screenshot is correct)
4. Rotate device to landscape
5. Click Calculator in Recent App to return to Calculator (Calculator has relaunched to landsacpe ui)
6. Launch Recent App again (the Calculator's screenshot is not updated)

Change-Id: I92e951ea2ee215c52ca6e50cf6f9e02deb787bce