Fixed the icon clipping of the notification shelf

Before the icon wasn't clipped to it's notification container
and could go out of bounds. We're now clipping it to it's
surrounding notification.

Change-Id: I1b9a3650eb3e3f0bcd7d7cef087afb7cc41ccf62
Fixes: 63477094
Test: add notifications, observe icon animations, better clipping
diff --git a/packages/SystemUI/res/values/ids.xml b/packages/SystemUI/res/values/ids.xml
index b27dedd..2148c80 100644
--- a/packages/SystemUI/res/values/ids.xml
+++ b/packages/SystemUI/res/values/ids.xml
@@ -59,6 +59,7 @@
     <item type="id" name="transformation_start_y_tag"/>
     <item type="id" name="transformation_start_scale_x_tag"/>
     <item type="id" name="transformation_start_scale_y_tag"/>
+    <item type="id" name="continuous_clipping_tag"/>
 
     <!-- Whether the icon is from a notification for which targetSdk < L -->
     <item type="id" name="icon_is_pre_L"/>