Adding base colors to iconLib

Bug: 161980186
Test: Presubmit
Change-Id: I47cd7cf71f43ddd40516a2310a1ce1e8782235d8
diff --git a/iconloaderlib/res/values/colors.xml b/iconloaderlib/res/values/colors.xml
index 873b2fc..70582c2 100644
--- a/iconloaderlib/res/values/colors.xml
+++ b/iconloaderlib/res/values/colors.xml
@@ -18,4 +18,7 @@
 -->
 <resources>
     <color name="legacy_icon_background">#FFFFFF</color>
+
+    <!-- Yellow 600, used for highlighting "important" conversations in settings & notifications -->
+    <color name="important_conversation">#f9ab00</color>
 </resources>