Fix deadlock of WebViewCoreThread

There was a deadlock in destroy process.
Investigation showed that WebViewCoreThread is waiting some
callbacks but in this case WebViewCoreThread can not resume
itself not to call notify method.

Flow:
1. CallbackProxy.sendMessageToUiThreadSync
2. WebViewClassic.destroy()
3. CallbackProxy.blockMessages()
4. CallbackProxy.handleMessage is called via MainThread
5. The WebViewCoreThread deadlock is occured.

The cases we have to call notify method are followings.
OVERRIDE_URL
CREATE_WINDOW
SAVE_PASSWORD
NOTIFY
OPEN_FILE_CHOOSER
JS_ALERT
JS_CONFIRM
JS_PROMPT
JS_UNLOAD
JS_TIMEOUT

Change-Id: I9d95ae500bf6338d77b32b5fa15de7cff5720d0f
Fixed incorrect calculation of dirty invalidation area

Padding was already taken into consideration before calling
invalidateDrawable in ProgressBar.

Change-Id: Id7f23bd15bb19e2294c07adb2acb397100ea97e8
Avoid adding FORWARD_LOCK flag to an updated system app

Consider the following case:
1. An app exists in /system/app or /vendor/app. (i.e, it's a system app)
2. If the app would be updated as a forward-lock app by downloading from
   market(google play), then it would be installed in /data/app-private.
3. Moreover, if it would be updated by the whole system image (i.e, FOTA
   or something like that), then the app would be applied a FORWARD_LOCK
   flag.

The app SHOULD NOT have a FORWARD_LCOK flag. Because the resource path
of such app does not refer to the proper resources to access.

Change-Id: I0750f69a93a3115f4201029796b598507de3555f
Guarantee that all db related files are deleted together.

When deleting a db file, all db related files has to be deleted together
like journal, wal, shm etc.

Change-Id: I49d4581673d03fe669e9e0eaa2b50f7b9d3c34a4
Signed-off-by: jangwon.lee <jangwon.lee@lge.com>
When deleting a db file,
Context.deleteDatabase() has to be called instead of File.delete()
to guarantee all db related files
like journal, wal, shm, etc are deleted together.

Signed-off-by: jangwon.lee<jangwon.lee@lge.com>

Change-Id: I3c3d7dfa13ffbe709ab7d8a5c7cfe6cfa2864fea