Worklet: Lazily create PaintWorkletGlobalScopes

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

Index: third_party/WebKit/Source/modules/csspaint/PaintWorkletPendingGeneratorRegistry.cpp
diff --git a/third_party/WebKit/Source/modules/csspaint/PaintWorkletPendingGeneratorRegistry.cpp b/third_party/WebKit/Source/modules/csspaint/PaintWorkletPendingGeneratorRegistry.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f8ae4b7957b423ebe2b3db7fccbadf1035b5819d
--- /dev/null
+++ b/third_party/WebKit/Source/modules/csspaint/PaintWorkletPendingGeneratorRegistry.cpp
@@ -0,0 +1,38 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "modules/csspaint/PaintWorkletPendingGeneratorRegistry.h"
+
+#include "modules/csspaint/CSSPaintDefinition.h"
+
+namespace blink {
+
+void PaintWorkletPendingGeneratorRegistry::SetDefinition(
+    const String& name,
+    CSSPaintDefinition* definition) {
+  GeneratorHashSet* set = pending_generators_.at(name);
+  if (set) {
+    for (const auto& generator : *set) {
+      if (generator)
+        generator->SetDefinition(definition);
+    }
+  }
+  pending_generators_.erase(name);
+}
+
+void PaintWorkletPendingGeneratorRegistry::AddPendingGenerator(
+    const String& name,
+    CSSPaintImageGeneratorImpl* generator) {
+  Member<GeneratorHashSet>& set =
+      pending_generators_.insert(name, nullptr).stored_value->value;
+  if (!set)
+    set = new GeneratorHashSet;
+  set->insert(generator);
+}
+
+DEFINE_TRACE(PaintWorkletPendingGeneratorRegistry) {
+  visitor->Trace(pending_generators_);
+}
+
+}  // namespace blink