bootanim: Add continuous splash support
 * We may or may not want to have a very smooth transition from the
   bootloader into Android by way of a continuous splash feature.
 * Add a compile-time flag which disables the initial screen clearing
   so that we don't drop a frame during the transition.

Change-Id: Ic453c901f1030ffebd9bdbeec59109bb5c585629
[1/2] Base: Lockscreen wallpaper
Allows user to choose a custom wallpaper for lockscreen
Changeable through Settings->Display->Wallpaper->Lockscreen
Or Settings->SecuritySettings->Lockscreen->CustomBackground

OmniGears: https://gerrit.omnirom.org/6574

Change-Id: I97a6d31ef8915bc3a12b48426afbd6d0b92a41f6

Conflicts:
	core/java/android/provider/Settings.java
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java
Hang off call by power button while screen is on
Enable power button end call and screen is off.  User use power button
to turn on screen will end call.  Should turn on screen and not end call

Change-Id: Idf34f7724dbf1796205332c5c7ef663102f8a30c
Signed-off-by: shower <shower929@gmail.com>
Do not show Home behind full screen activity
When ensureActivitiesVisibleLocked goes through foreground activity
stack and reaches non-fullscreen activity, it sets showHomeBehindStack
variable to true.

If there is a fullscreen activity behind, showHomeBehindStack remains
unchanged, which causes Home application to be displayed anyway.
In this case user will see a fullscreen activity and Home activity
simultaneously.

To fix the issue we set showHomeBehindStack to false when we reach
fullscreen activity in the activity stack.

This was made visible by the following commit:
446ef1d

Change-Id: I535c1283a4e26f5cf606375b837d4b7195324af0
Prevent Lockscreen album art from activating FLAG_KEEP_SCREEN_ON
This is a small fix to the showWallpaper method, in which a power
consumption problem has been introduced. This showWallpaper method
toggles the window flag FLAG_SHOW_WALLPAPER, when album art is being
shown in Lockscreen. It is important to set pixel format to
PixelFormat.OPAQUE if flag FLAG_SHOW_WALLPAPER is not being set.

If not, an application that uses window flag FLAG_KEEP_SCREEN_ON
will prevent the keyguard from going to sleep and drain battery.

Change-Id: I1808be28047977ae5ac4dd1168ea25cac8a55a78
remove unnecessary switchUser call
If userId doesn't change, no need to do switchuser.or it will
introduce some tweak for gps modules in quick off/on because
they need cost time in off/on.

Change-Id: Ie5e408dc8be69c8a63a18bcb2cfe478cef4d70e6
Signed-off-by: Jianzheng Zhou <jianzheng.zhou@freescale.com>