WIP: Create a LongStringCollection that transfers long strings with fewer copies.

third_party/WebKit/Source/bindings/core/v8/SerializedScriptValue.h

Index: third_party/WebKit/Source/bindings/core/v8/SerializedScriptValue.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/SerializedScriptValue.h b/third_party/WebKit/Source/bindings/core/v8/SerializedScriptValue.h
index 2317349b8a006cfadb5d890e5af3578bdc8ee599..fa9ba734e4ba5c06c482901c1143a2ced243788a 100644
--- a/third_party/WebKit/Source/bindings/core/v8/SerializedScriptValue.h
+++ b/third_party/WebKit/Source/bindings/core/v8/SerializedScriptValue.h
@@ -36,6 +36,7 @@
 #include "bindings/core/v8/NativeValueTraits.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/Transferables.h"
+#include "bindings/core/v8/serialization/LongStringCollection.h"
 #include "core/CoreExport.h"
 #include "v8/include/v8.h"
 #include "wtf/Allocator.h"
@@ -81,6 +82,7 @@ class CORE_EXPORT SerializedScriptValue
     STACK_ALLOCATED();
     Transferables* transferables = nullptr;
     WebBlobInfoArray* blobInfo = nullptr;
+    LongStringPolicy longStringPolicy;
   };
   static PassRefPtr<SerializedScriptValue> serialize(v8::Isolate*,
                                                      v8::Local<v8::Value>,
@@ -91,6 +93,7 @@ class CORE_EXPORT SerializedScriptValue
       v8::Local<v8::Value>);
 
   static PassRefPtr<SerializedScriptValue> create();
+  static PassRefPtr<SerializedScriptValue> create(LongStringPolicy);
   static PassRefPtr<SerializedScriptValue> create(const String&);
   static PassRefPtr<SerializedScriptValue> create(const char* data,
                                                   size_t length);
@@ -164,6 +167,7 @@ class CORE_EXPORT SerializedScriptValue
   ImageBitmapContentsArray* getImageBitmapContentsArray() {
     return m_imageBitmapContentsArray.get();
   }
+  const LongStringCollection& longStrings() { return m_longStrings; }
 
  private:
   friend class ScriptValueSerializer;
@@ -175,6 +179,7 @@ class CORE_EXPORT SerializedScriptValue
   using DataBufferPtr = std::unique_ptr<uint8_t[], BufferDeleter>;
 
   SerializedScriptValue();
+  explicit SerializedScriptValue(LongStringPolicy);
   explicit SerializedScriptValue(const String& wireData);
 
   void setData(DataBufferPtr data, size_t size) {
@@ -198,6 +203,7 @@ class CORE_EXPORT SerializedScriptValue
   std::unique_ptr<ArrayBufferContentsArray> m_arrayBufferContentsArray;
   std::unique_ptr<ImageBitmapContentsArray> m_imageBitmapContentsArray;
   BlobDataHandleMap m_blobDataHandles;
+  LongStringCollection m_longStrings;
 
   bool m_hasRegisteredExternalAllocation;
   bool m_transferablesNeedExternalAllocationRegistration;