Make LEGACY_ICON_TREATMENT flag work

- targetSdk needs to be 26
- android:color attribute has been deleted

Change-Id: I6b1fc5402233fb8844b475d562984cf6924e33ac
diff --git a/res/drawable-v26/adaptive_icon_drawable_wrapper.xml b/res/drawable-v26/adaptive_icon_drawable_wrapper.xml
index 7ad8e2c..2d78b69 100644
--- a/res/drawable-v26/adaptive_icon_drawable_wrapper.xml
+++ b/res/drawable-v26/adaptive_icon_drawable_wrapper.xml
@@ -15,7 +15,7 @@
      limitations under the License.
 -->
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:color="#FFE0E0E0"/>
+    <background android:drawable="@color/legacy_icon_background"/>
     <foreground>
         <com.android.launcher3.graphics.FixedScaleDrawable />
     </foreground>
diff --git a/res/values/colors.xml b/res/values/colors.xml
index e344571..455729c 100644
--- a/res/values/colors.xml
+++ b/res/values/colors.xml
@@ -36,4 +36,5 @@
     <color name="notification_color_beneath">#E0E0E0</color> <!-- Gray 300 -->
     <color name="divider_color">@color/notification_color_beneath</color>
     <color name="icon_background">#E0E0E0</color> <!-- Gray 300 -->
+    <color name="legacy_icon_background">#FFFFFF</color>
 </resources>