NIU Actions: Support Dark Mode and Landscape

This adds light and dark color variants for the UI elements on the Go Recents screen. Toggling Dark Mode will switch between the themes. Additionally, the button spacing definitions have been updated to better support Landscape orientation.

Bug: 187866121
Bug: 183714277
Test: Manual (Pixel 3A)
Change-Id: Ia2c0cbf372882aad87e4018d10d8f85bd92842e0
diff --git a/go/quickstep/res/values/styles.xml b/go/quickstep/res/values/styles.xml
index 9b3fe67..59f7377 100644
--- a/go/quickstep/res/values/styles.xml
+++ b/go/quickstep/res/values/styles.xml
@@ -15,9 +15,25 @@
      limitations under the License.
 -->
 <resources>
+    <!-- App themes -->
+    <style name="AppTheme" parent="@style/LauncherTheme">
+        <item name="overviewBackgroundColor">@color/go_overview_background_color</item>
+        <item name="overviewButtonTextColor">@color/go_overview_text_color</item>
+        <item name="overviewButtonIconColor">@color/go_overview_text_color</item>
+        <item name="overviewButtonBackgroundColor">@color/go_overview_button_color</item>
+    </style>
+
+    <style name="AppTheme.Dark" parent="@style/LauncherTheme.Dark">
+        <item name="overviewBackgroundColor">@color/go_overview_background_color_dark</item>
+        <item name="overviewButtonTextColor">@color/go_overview_text_color_dark</item>
+        <item name="overviewButtonIconColor">@color/go_overview_text_color_dark</item>
+        <item name="overviewButtonBackgroundColor">@color/go_overview_button_color_dark</item>
+    </style>
+
+    <!-- Overview -->
     <style name="GoOverviewActionButton">
-        <item name="android:tint">@color/go_overview_button_icon_color</item>
-        <item name="android:backgroundTint">@color/go_overview_button_color</item>
+        <item name="android:tint">?attr/overviewButtonIconColor</item>
+        <item name="android:backgroundTint">?attr/overviewButtonBackgroundColor</item>
         <item name="android:background">@drawable/round_rect_button</item>
         <item name="android:layout_width">@dimen/go_overview_button_width</item>
         <item name="android:layout_height">@dimen/go_overview_button_height</item>
@@ -27,7 +43,7 @@
     <style name="GoOverviewActionButtonCaption">
         <item name="android:fontFamily">sans-serif-medium</item>
         <item name="android:textSize">14dp</item>
-        <item name="android:textColor">@color/go_overview_button_icon_color</item>
+        <item name="android:textColor">?attr/overviewButtonTextColor</item>
         <item name="android:lineHeight">20dp</item>
         <item name="android:textAlignment">center</item>
         <item name="android:importantForAccessibility">no</item>