Tune up 7 inch keyboard layout

Bug: 4479212
Change-Id: I25c48ef474f6198dde9b670b23509c087acae149
diff --git a/java/res/values-sw768dp/dimens.xml b/java/res/values-sw768dp/dimens.xml
index 74eab5f..d8d1332 100644
--- a/java/res/values-sw768dp/dimens.xml
+++ b/java/res/values-sw768dp/dimens.xml
@@ -21,6 +21,7 @@
 <resources>
     <!-- keyboardHeight = key_height*4 + key_bottom_gap*3, key_height=12mm -->
     <dimen name="keyboardHeight">48.0mm</dimen>
+    <fraction name="maxKeyboardHeight">50%p</fraction>
     <fraction name="minKeyboardHeight">-35.0%p</fraction>
     <!-- key_height + key_bottom_gap = popup_key_height -->
     <!-- <dimen name="key_height">14.5mm</dimen> -->
@@ -38,10 +39,10 @@
     <!-- popup_key_height x -1.0 -->
     <dimen name="mini_keyboard_vertical_correction">-13.0mm</dimen>
 
-    <fraction name="key_letter_ratio">34.4%</fraction>
-    <fraction name="key_label_ratio">21.2%</fraction>
+    <fraction name="key_letter_ratio">38%</fraction>
+    <fraction name="key_label_ratio">26%</fraction>
     <fraction name="key_hint_letter_ratio">23%</fraction>
-    <fraction name="key_uppercase_letter_ratio">28%</fraction>
+    <fraction name="key_uppercase_letter_ratio">25%</fraction>
     <!-- left or right padding of label alignment -->
     <dimen name="key_label_horizontal_alignment_padding">6dip</dimen>
     <fraction name="key_preview_text_ratio">26.3%</fraction>