[Styles] Merge in style updates

Merge in style updates and split pane updates related
to timeline view into open-source-friendly branch,
WTD-901

platform/commonUI/general/res/sass/_effects.scss

@@ -14,6 +14,10 @@ a.disabled {
     @include boxOutline();
 }
 
+.test-stripes {
+	@include bgDiagonalStripes();
+}
+
 .test {
 	@include test();
 }