Add methods for creating V8 extras-based ReadableStreams from C++

third_party/WebKit/Source/bindings/core/v8/ToV8.h

Index: third_party/WebKit/Source/bindings/core/v8/ToV8.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/ToV8.h b/third_party/WebKit/Source/bindings/core/v8/ToV8.h
index e211d9ca61313f245fe71486a6d4c3e545c1fbec..926cec829001fa6ff945b1f82e45d51ed08396b7 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ToV8.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ToV8.h
@@ -262,6 +262,13 @@ inline v8::Local<v8::Value> toV8(T&& value, ScriptState* scriptState)
 // This hack helps detect such unwanted implicit conversions from T* to bool.
 v8::Local<v8::Value> toV8(void* value, v8::Local<v8::Object> creationContext, v8::Isolate*) = delete;
 
+// Cannot define in ScriptValue because of the circular dependency between toV8 and ScriptValue
+template<typename T>
+inline ScriptValue ScriptValue::from(ScriptState* scriptState, T&& value)
+{
+    return ScriptValue(scriptState, toV8(std::forward<T>(value), scriptState));
+}
+
 } // namespace blink
 
 #endif // ToV8_h