Fix 3384942: Force ASCII-capable IME to show on lockscreen

Only Latin-1 based passwords are supported on the system at
this point.  As such, we need a way to show a Latin-1-compliant
keyboard when unlocking the device.

It is expected that 3rd party IMEs honor this mode for Latin-1
password dialogs. If not, this change will cause lockscreen to
revert to using the Android system IME for entering the password.

Change-Id: I59bb56f6f5968b5abc50cf1b9b26c19ca4f183e4

core/res/res/layout-sw600dp/keyguard_screen_password_landscape.xml

@@ -62,6 +62,7 @@
                 android:textAppearance="?android:attr/textAppearanceMedium"
                 android:background="@drawable/lockscreen_password_field_dark"
                 android:textColor="#ffffffff"
+                android:privateImeOptions="com.google.android.inputmethod.latin.forceAscii"
                 />
 
             <!-- Numeric keyboard -->

core/res/res/layout-sw600dp/keyguard_screen_password_portrait.xml

@@ -58,6 +58,7 @@
             android:textAppearance="?android:attr/textAppearanceMedium"
             android:background="@drawable/lockscreen_password_field_dark"
             android:textColor="#ffffffff"
+            android:privateImeOptions="com.google.android.inputmethod.latin.forceAscii"
             />
 
         <View

core/res/res/layout/keyguard_screen_password_landscape.xml

@@ -152,6 +152,7 @@
             android:background="@null"
             android:textColor="?android:attr/textColorPrimary"
             android:imeOptions="flagNoFullscreen|actionDone"
+            android:privateImeOptions="com.google.android.inputmethod.latin.forceAscii"
             />
 
         <!-- This delete button is only visible for numeric PIN entry -->

core/res/res/layout/keyguard_screen_password_portrait.xml

@@ -117,6 +117,7 @@
             android:textAppearance="?android:attr/textAppearanceMedium"
             android:textColor="#ffffffff"
             android:imeOptions="actionDone"
+            android:privateImeOptions="com.google.android.inputmethod.latin.forceAscii"
             />
 
         <!-- This delete button is only visible for numeric PIN entry -->