FIX Null Pointer Exception on dialog cancel

Null Pointer Exception occurs because mWebViewCore instance
is made to null while calling destroyJava(). When
1.webview hosting activity goest to background, without calling webview onPause().
2. If app is launched again (having launchmode:singletask ) and another activity (not  webview hosting) comes on top top.
3. It destorys the previous activity holding webview which internally tries to cancel the dialog, but webviewcore instance is null.
Null pointer exception is raised.

Change-Id: Idbcd30d0b0d4a35819444bbaa5c73cced8bb35a3
Signed-off-by: Amit Kumar <amitkecian@gmail.com>
Merge branch 'jellybean' of github.com:ParanoidAndroid/android_frameworks_base into jellybean
PWM: disable HW overlays for PIE

SurfaceFlinger wont wake up the GPU in SysUI's fullscreen state,
probably because it does not occupy any tangible region. That sets poor
PIE into software rendering, which has bad effects on transparency and
mdp compositioning. Disabling HW overlays as long as PIE is active seems
like a good alternative for now.

Change-Id: Ie7ed720edc5bbdd0cfb79c34a22996cf15fcd79b
simplify pie toggle icons

Change-Id: Ic251638b25e9cf09ba058c47b5b5cf383f6698a6
circle battery

full credits go to CyanogenMod

Change-Id: Iaafd11133047791bab5f6155491a8acc57b31009
circle battery bugfixes, margins, per-app-color

Change-Id: I8888a8bc401f6086836ff8d6827c6aa1ac20f9b4
Merge branch 'jellybean' into jellybean-legacy
Some fixes
Merge remote-tracking branch 'upstream/jellybean-legacy' into jellybean