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

third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl

Index: third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl
diff --git a/third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl b/third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl
index 88c099f63f39b47f318a4bdd583965cf3b558540..5b33b02d5aef23bf681156e74b6ebfcbd9dd7fa1 100644
--- a/third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl
+++ b/third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl
@@ -435,6 +435,7 @@ static void postMessageImpl(const char* interfaceName, {{cpp_class}}* instance,
     // This instance supports sending array buffers by move semantics.
     SerializedScriptValue::SerializeOptions options;
     options.transferables = &transferables;
+    options.longStringPolicy = LongStringPolicy(LongStringPolicy::kSameProcess, 512);
     message = SerializedScriptValue::serialize(info.GetIsolate(), info[0], options, exceptionState);
     if (exceptionState.hadException())
       return;