Refresh layout for dialpad

- update some assets for new holo UI
- Use system's TableLayout
-- ButtonGridLayout is hard to control from xml
-- Tried to use new system GridLayout, but it looks
   TableLayout was suitable for this purpose
- remove background drawables
- remove codes dynamically setting background for digit field

Change-Id: I75853eca37ffa3a554a407b181dedc9b92bcf9e7
diff --git a/res/layout/dialpad_fragment.xml b/res/layout/dialpad_fragment.xml
index 7601dfe..b91c27a 100644
--- a/res/layout/dialpad_fragment.xml
+++ b/res/layout/dialpad_fragment.xml
@@ -25,12 +25,16 @@
     <!-- Text field above the keypad where the digits are displayed.
          It's type is set to NULL (to disable the IME keyboard) in the
          java code.
+
+         Background drawable can be controlled programatically.
     -->
     <EditText android:id="@+id/digits"
         android:layout_width="match_parent"
         android:layout_height="@dimen/dialpad_digits_height"
+        android:layout_marginTop="10dip"
         android:gravity="center"
-        android:textAppearance="@style/DialtactsDigitsTextAppearance" />
+        android:textAppearance="@style/DialtactsDigitsTextAppearance"
+        android:textColor="?android:attr/textColorPrimaryInverse" />
 
     <!-- Keypad section -->
     <include layout="@layout/dialpad" />