Merge "Split home stack into home and recents stack"

diff --cc core/java/android/app/IActivityManager.aidl
Simple merge

diff --cc services/core/java/com/android/server/am/ActivityManagerService.java
Simple merge

diff --cc services/core/java/com/android/server/am/ActivityRecord.java
Simple merge

diff --cc services/core/java/com/android/server/am/ActivityStack.java
Simple merge

diff --cc services/core/java/com/android/server/am/ActivityStackSupervisor.java
Simple merge

diff --cc services/core/java/com/android/server/am/TaskRecord.java
Simple merge