WebViewCore: Fix the issue of wrong zoom density when opening web pages with overview mode disabled.

On JellyBean browser, when pages opened
 with "open pages in overview" disabled and "Default zoom" option set to
 "Far" or "Close", the zoom density is not correct.

 The issue is caused by the wrong scale factor calculated when setup
 viewport. it is fixed to 1.5 in JB. whereas it should be different for
 different "Default zoom" setting.

 This Patch will fix this issue. it set the scale factor to the
 defaultzoomscale calculated considering zoom density. it also add
 adjust process to guarantee the zoom density is right after navigating
 page with specified viewport "target-densitydpi".

 Author: Zang Lin <lin.zang@intel.com>
 Signed-off-by: Jack Ren <jack.ren@intel.com>
 Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>

Change-Id: I68dd193457c40ce9eb73635297ce7bb61b373bac
Wipe and re-create database on downgrade.

Not a very common situation but should fix some errors that could
 arise from flashing an old ROM over a new one, without wiping data.

Change-Id: I27f2a00396761105987830921bb3f8cb339d2171
Fix rotation animation in expanded mode.

When expanded mode is enabled we never changing
value of mTopIsFullscreen but it should be updated so
selectRotationAnimationLw will choose correct animation.

Change-Id: I08906d4237696fe549b3799da38b58a0d56ac62c
Keyguard: Set WIDGET_CATEGORY_KEYGUARD when AppWidgetHostView is created

Allows the default lockscreen widget to inherit the keyguard widget
host category.  Without this, only widgets added through
KeyguardActivityLauncher are assigned the correct
OPTION_APPWIDGET_HOST_CATEGORY.

Change-Id: Ic97818d85ca5f00da0ce43bb36006d66a6935363