Add unknown file size handling in ComplexFormDataBytesConsumer

third_party/WebKit/Source/modules/fetch/FormDataBytesConsumer.h

Index: third_party/WebKit/Source/modules/fetch/FormDataBytesConsumer.h
diff --git a/third_party/WebKit/Source/modules/fetch/FormDataBytesConsumer.h b/third_party/WebKit/Source/modules/fetch/FormDataBytesConsumer.h
index 6a45d075b46253b2a2a1cfcd25729e1bcb534eb0..0ab47d7d5bdbee6b9f17e7e89126b9b9952a25e8 100644
--- a/third_party/WebKit/Source/modules/fetch/FormDataBytesConsumer.h
+++ b/third_party/WebKit/Source/modules/fetch/FormDataBytesConsumer.h
@@ -9,6 +9,7 @@
 #include "modules/fetch/BytesConsumer.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
+#include "wtf/Functional.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
@@ -19,6 +20,9 @@ class EncodedFormData;
 
 class FormDataBytesConsumer final : public BytesConsumer {
  public:
+  using BytesConsumerFactory =
+      Function<BytesConsumer*(ExecutionContext*, PassRefPtr<BlobDataHandle>)>;
+
   explicit MODULES_EXPORT FormDataBytesConsumer(const String&);
   explicit MODULES_EXPORT FormDataBytesConsumer(DOMArrayBuffer*);
   explicit MODULES_EXPORT FormDataBytesConsumer(DOMArrayBufferView*);
@@ -28,9 +32,9 @@ class FormDataBytesConsumer final : public BytesConsumer {
   MODULES_EXPORT static FormDataBytesConsumer* createForTesting(
       ExecutionContext* executionContext,
       PassRefPtr<EncodedFormData> formData,
-      BytesConsumer* consumer) {
+      std::unique_ptr<BytesConsumerFactory> factory) {
     return new FormDataBytesConsumer(executionContext, std::move(formData),
-                                     consumer);
+                                     std::move(factory));
   }
 
   // BytesConsumer implementation
@@ -64,7 +68,7 @@ class FormDataBytesConsumer final : public BytesConsumer {
  private:
   MODULES_EXPORT FormDataBytesConsumer(ExecutionContext*,
                                        PassRefPtr<EncodedFormData>,
-                                       BytesConsumer*);
+                                       std::unique_ptr<BytesConsumerFactory>);
 
   const Member<BytesConsumer> m_impl;
 };