Make Navring available to devices with no navbar

Swipe up from bottom of screen to access navring

Change-Id: Ib29b37f26187a65faef17571328cef57f6896b29
Fix resource leak: When call MediaMetadataRetriever.setDataSource or getFrameAtTime should ensure call release in finally to avoid resource leak
                   Patch set 2: Remove unnecessary white spaces

Change-Id: I49a7f2fb99dc8b9560e7c17421125356e45a87ac
[ActivityManager]: Fix the activity visibility state not sync between ActivityManager and WindowManager

Symptom:
When press Home key to home screen, user is able to see the activity's window shown on top of wallpaper and below launcher(widgets).

Root Cause:
The ensureActivitiesVisibleLocked() is called pretty often (for example when a new process bound).
If the top activity "B" was finishing, then the previous activity "A" should be visible.
Therefore, the activity "A" window will be set to visible and then launched activity "A", but it does not updates the visible state in ActivityRecord for "A".
There has a timing issue that if a new activity "C" is started, "C" becomes the new top activity and be resumed.
In that case, Activity "A" window will remain visible even if it is behind a full screen activity "C" because the ActivityRecord.visble of "A" is still false, so the window visibility won't be update.
So when user press home key and back to launcher, the surface of activity "A" will be composed on top of wallpaper.

Solution:
Updates ActivityRecord.visible to true for "A". After "C" is started, the "A" will be called WindowManagerService.setAppVisibility() to set invisible, then called onStop() when execute ensureActivitiesVisibleLocked() again.

Change-Id: I536ba04b95d8d274fea6d679a6493e620bc981e2
Fixed cancel() not working correctly

The method handleMessage(Message msg) from mHandler variable was
not checking if the timer was cancelled, so
sendMessageDelayed(obtainMessage(MSG), delay) was keeping the
timer alive. The patch simply adds a boolean and checks if the
CountDownTimer was cancelled before calling
sendMessageDelayed(obtainMessage(MSG), delay)

bug: https://code.google.com/p/android/issues/detail?id=58668

Change-Id: Ic6bbb9d33a3616f8503db222513cc14ad2270cb8
Signed-off-by: jl1990 <jlcarrasco1990@gmail.com>
Missing break in switch statement

Change-Id: I462c0c5fec96a850032266b04419ec409ad02174
Merge "Fixed cancel() not working correctly" into kitkat
Merge "Fix resource leak: When call MediaMetadataRetriever.setDataSource or getFrameAtTime should ensure call release in finally to avoid resource leak                    Patch set 2: Remove unnecessary white spaces" into kitkat
Merge "[ActivityManager]: Fix the activity visibility state not sync between ActivityManager and WindowManager" into kitkat
Merge "Make Navring available to devices with no navbar" into kitkat
fw: Ribbons Icon Gravity

Change-Id: I2ab6bd7231aae38a847c809e74f1374c9ddcb8ce
Signed-off-by: Steve Spear <steve.spear@openpeak.com>
Merge pull request #1 from AOKP/kitkat

merge from AOKP