Add keyboard shadow

This CL sets 8dp elevation ot input view in order to cast a shadow
onto underlying application.

Bug: 16210054
Change-Id: I7779c63612fc88e24dde65de3e4e7a45b9d1762f
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index f2072fd..be35d13 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -20,6 +20,8 @@
 
 <resources>
     <declare-styleable name="KeyboardTheme">
+        <!-- InputView style -->
+        <attr name="inputViewStyle" format="reference" />
         <!-- Keyboard style -->
         <attr name="keyboardStyle" format="reference" />
         <!-- KeyboardView style -->
diff --git a/java/res/values/themes-common.xml b/java/res/values/themes-common.xml
index 110f6b7..f7cb10f 100644
--- a/java/res/values/themes-common.xml
+++ b/java/res/values/themes-common.xml
@@ -20,6 +20,7 @@
 
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
     <style name="KeyboardIcons" />
+    <style name="InputView" />
     <!-- Default theme values -->
     <style name="Keyboard">
         <item name="rowHeight">25%p</item>
diff --git a/java/res/values/themes-holo.xml b/java/res/values/themes-holo.xml
index 9f1bd2f..efac656 100644
--- a/java/res/values/themes-holo.xml
+++ b/java/res/values/themes-holo.xml
@@ -19,6 +19,10 @@
 -->
 
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
+    <style
+        name="InputView.Holo"
+        parent="InputView"
+    />
     <!-- Holo KeyboardView theme (ICS and KLP) -->
     <style
         name="KeyboardView.Holo"
diff --git a/java/res/values/themes-ics.xml b/java/res/values/themes-ics.xml
index bfbac0a..ecf40e4 100644
--- a/java/res/values/themes-ics.xml
+++ b/java/res/values/themes-ics.xml
@@ -20,6 +20,7 @@
 
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
     <style name="KeyboardTheme.ICS" parent="KeyboardIcons.Holo">
+        <item name="inputViewStyle">@style/InputView.Holo</item>
         <item name="keyboardStyle">@style/Keyboard.ICS</item>
         <item name="keyboardViewStyle">@style/KeyboardView.ICS</item>
         <item name="mainKeyboardViewStyle">@style/MainKeyboardView.ICS</item>
diff --git a/java/res/values/themes-klp.xml b/java/res/values/themes-klp.xml
index 36b1fc1..de1cd9b 100644
--- a/java/res/values/themes-klp.xml
+++ b/java/res/values/themes-klp.xml
@@ -20,6 +20,7 @@
 
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
     <style name="KeyboardTheme.KLP" parent="KeyboardIcons.Holo">
+        <item name="inputViewStyle">@style/InputView.Holo</item>
         <item name="keyboardStyle">@style/Keyboard.KLP</item>
         <item name="keyboardViewStyle">@style/KeyboardView.KLP</item>
         <item name="mainKeyboardViewStyle">@style/MainKeyboardView.KLP</item>
diff --git a/java/res/values/themes-lxx-dark.xml b/java/res/values/themes-lxx-dark.xml
index 67f94f3..b081772 100644
--- a/java/res/values/themes-lxx-dark.xml
+++ b/java/res/values/themes-lxx-dark.xml
@@ -20,6 +20,7 @@
 
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
     <style name="KeyboardTheme.LXX_Dark" parent="KeyboardIcons.LXX_Dark">
+        <item name="inputViewStyle">@style/InputView.LXX</item>
         <item name="keyboardStyle">@style/Keyboard.LXX_Dark</item>
         <item name="keyboardViewStyle">@style/KeyboardView.LXX_Dark</item>
         <item name="mainKeyboardViewStyle">@style/MainKeyboardView.LXX_Dark</item>
diff --git a/java/res/values/themes-lxx-light.xml b/java/res/values/themes-lxx-light.xml
index be817f4..3d294e4 100644
--- a/java/res/values/themes-lxx-light.xml
+++ b/java/res/values/themes-lxx-light.xml
@@ -20,6 +20,7 @@
 
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
     <style name="KeyboardTheme.LXX_Light" parent="KeyboardIcons.LXX_Light">
+        <item name="inputViewStyle">@style/InputView.LXX</item>
         <item name="keyboardStyle">@style/Keyboard.LXX_Light</item>
         <item name="keyboardViewStyle">@style/KeyboardView.LXX_Light</item>
         <item name="mainKeyboardViewStyle">@style/MainKeyboardView.LXX_Light</item>
diff --git a/java/res/values/themes-lxx.xml b/java/res/values/themes-lxx.xml
index c721888..463306b 100644
--- a/java/res/values/themes-lxx.xml
+++ b/java/res/values/themes-lxx.xml
@@ -19,6 +19,10 @@
 -->
 
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
+    <style
+        name="InputView.LXX"
+        parent="InputView"
+    />
     <!-- LXX KeyboardView theme (LXX_Light and LXX_Dark) -->
     <style
         name="KeyboardView.LXX"