[DONT COMMIT] PaintWorklet: Move paintWorklet from 'window' to 'CSS'

third_party/WebKit/Source/modules/csspaint/CSSPaintWorklet.idl

Index: third_party/WebKit/Source/modules/csspaint/CSSPaintWorklet.idl
diff --git a/third_party/WebKit/Source/modules/csspaint/WindowPaintWorklet.idl b/third_party/WebKit/Source/modules/csspaint/CSSPaintWorklet.idl
similarity index 53%
rename from third_party/WebKit/Source/modules/csspaint/WindowPaintWorklet.idl
rename to third_party/WebKit/Source/modules/csspaint/CSSPaintWorklet.idl
index 0e774ba93ad3e1c58543b915a9f7a154bf16a9d9..6e5d0a350a9cb944f218c481b15c46aa84b97a96 100644
--- a/third_party/WebKit/Source/modules/csspaint/WindowPaintWorklet.idl
+++ b/third_party/WebKit/Source/modules/csspaint/CSSPaintWorklet.idl
@@ -2,8 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// https://drafts.css-houdini.org/css-paint-api-1/#dom-css-paintworklet
+
 [
     RuntimeEnabled=CSSPaintAPI,
-] partial interface Window {
-    readonly attribute Worklet paintWorklet;
+] partial interface CSS {
+    [CallWith=ScriptState] static readonly attribute Worklet paintWorklet;
 };