Make OffscreenCanvas Transferable

third_party/WebKit/Source/bindings/modules/v8/SerializedScriptValueForModulesFactory.cpp

Index: third_party/WebKit/Source/bindings/modules/v8/SerializedScriptValueForModulesFactory.cpp
diff --git a/third_party/WebKit/Source/bindings/modules/v8/SerializedScriptValueForModulesFactory.cpp b/third_party/WebKit/Source/bindings/modules/v8/SerializedScriptValueForModulesFactory.cpp
index a127ba5450a904ed05713f7536019d6590663267..6a0412d35f18782b5ee46c7c2d570c9f7880e173 100644
--- a/third_party/WebKit/Source/bindings/modules/v8/SerializedScriptValueForModulesFactory.cpp
+++ b/third_party/WebKit/Source/bindings/modules/v8/SerializedScriptValueForModulesFactory.cpp
@@ -7,6 +7,7 @@
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/SerializedScriptValue.h"
 #include "bindings/modules/v8/ScriptValueSerializerForModules.h"
+#include "bindings/modules/v8/TransferableOffscreenCanvas.h"
 #include "core/dom/ExceptionCode.h"
 
 namespace blink {
@@ -50,6 +51,37 @@ PassRefPtr<SerializedScriptValue> SerializedScriptValueForModulesFactory::create
     return createFromWire(wireData);
 }
 
+void SerializedScriptValueForModulesFactory::transferData(SerializedScriptValue* serializedValue, SerializedScriptValueWriter& writer, TransferableArray* transferables, ExceptionState& exceptionState, v8::Isolate* isolate)
+{
+    serializedValue->setData(writer.takeWireString());
+    ASSERT(serializedValue->data().impl()->hasOneRef());
+    if (!transferables)
+        return;
+    if (auto* transferableOffscreenCanvases = TransferableOffscreenCanvas::get(*transferables)) {
+        HeapVector<Member<OffscreenCanvas>, 1> offscreenCanvases = transferableOffscreenCanvases->getArray();
+        if (offscreenCanvases.size()) {
+            for (size_t i = 0; i < offscreenCanvases.size(); i++) {
+                if (offscreenCanvases[i]->isNeutered()) {
+                    exceptionState.throwDOMException(DataCloneError, "OffscreenCanvas at index " + String::number(i) + " is already neutered.");
+                    return;
+                }
+                if (offscreenCanvases[i]->renderingContext()) {
+                    exceptionState.throwDOMException(DataCloneError, "OffscreenCanvas at index " + String::number(i) + " has an associated context.");
+                    return;
+                }
+            }
+            HeapHashSet<Member<OffscreenCanvas>> visited;
+            for (size_t i = 0; i < offscreenCanvases.size(); i++) {
+                if (visited.contains(offscreenCanvases[i].get()))
+                    continue;
+                visited.add(offscreenCanvases[i].get());
+                offscreenCanvases[i].get()->setNeutered();
+            }
+        }
+    }
+    SerializedScriptValueFactory::transferData(serializedValue, writer, transferables, exceptionState, isolate);
+}
+
 ScriptValueSerializer::Status SerializedScriptValueForModulesFactory::doSerialize(v8::Local<v8::Value> value, SerializedScriptValueWriter& writer, MessagePortArray* messagePorts, TransferableArray* transferables, WebBlobInfoArray* blobInfo, BlobDataHandleMap& blobDataHandles, v8::TryCatch& tryCatch, String& errorMessage, v8::Isolate* isolate)
 {
     ScriptValueSerializerForModules serializer(writer, messagePorts, transferables, blobInfo, blobDataHandles, tryCatch, ScriptState::current(isolate));