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

third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp

Index: third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp
diff --git a/third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp b/third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp
index bef58fcd3961ed1343b2c1688bb99a3ec19f3298..68e84f233a3f679d40c58bb7337d2755e2d41b45 100644
--- a/third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp
+++ b/third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp
@@ -6,11 +6,23 @@
 
 #include "bindings/core/v8/V8BindingForCore.h"
 #include "core/dom/Document.h"
+#include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
 #include "modules/csspaint/PaintWorkletGlobalScope.h"
 
 namespace blink {
 
+// static
+PaintWorklet* PaintWorklet::From(LocalDOMWindow& window) {
+  PaintWorklet* supplement = static_cast<PaintWorklet*>(
+      Supplement<LocalDOMWindow>::From(window, SupplementName()));
+  if (!supplement && window.GetFrame()) {
+    supplement = Create(window.GetFrame());
+    ProvideTo(window, SupplementName(), supplement);
+  }
+  return supplement;
+}
+
 // static
 PaintWorklet* PaintWorklet::Create(LocalFrame* frame) {
   return new PaintWorklet(frame);
@@ -18,6 +30,7 @@ PaintWorklet* PaintWorklet::Create(LocalFrame* frame) {
 
 PaintWorklet::PaintWorklet(LocalFrame* frame)
     : Worklet(frame),
+      Supplement<LocalDOMWindow>(*frame->DomWindow()),
       pending_generator_registry_(new PaintWorkletPendingGeneratorRegistry) {}
 
 PaintWorklet::~PaintWorklet() = default;
@@ -36,9 +49,14 @@ void PaintWorklet::AddPendingGenerator(const String& name,
   pending_generator_registry_->AddPendingGenerator(name, generator);
 }
 
+const char* PaintWorklet::SupplementName() {
+  return "PaintWorklet";
+}
+
 DEFINE_TRACE(PaintWorklet) {
   visitor->Trace(pending_generator_registry_);
   Worklet::Trace(visitor);
+  Supplement<LocalDOMWindow>::Trace(visitor);
 }
 
 bool PaintWorklet::NeedsToCreateGlobalScope() {