[Fetch API] Implement Request.formData and Response.formData.

third_party/WebKit/Source/modules/fetch/BodyStreamBuffer.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/fetch/BodyStreamBuffer.h"
 
 #include <memory>
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/DOMTypedArray.h"
@@ skipping 30 matching lines @@
       PassRefPtr<BlobDataHandle> blob_data_handle) override {
     buffer_->EndLoading();
     client_->DidFetchDataLoadedBlobHandle(std::move(blob_data_handle));
   }
 
   void DidFetchDataLoadedArrayBuffer(DOMArrayBuffer* array_buffer) override {
     buffer_->EndLoading();
     client_->DidFetchDataLoadedArrayBuffer(array_buffer);
   }
 
+  void DidFetchDataLoadedFormData(FormData* form_data) override {
+    buffer_->EndLoading();
+    client_->DidFetchDataLoadedFormData(form_data);
+  }
+
   void DidFetchDataLoadedString(const String& string) override {
     buffer_->EndLoading();
     client_->DidFetchDataLoadedString(string);
   }
 
   void DidFetchDataLoadedDataPipe() override {
     buffer_->EndLoading();
     client_->DidFetchDataLoadedDataPipe();
   }
 
@@ skipping 216 matching lines @@
   }
 
   ScriptState::Scope scope(script_state_.Get());
   NonThrowableExceptionState exception_state;
   ScriptValue reader = ReadableStreamOperations::GetReader(
       script_state_.Get(), Stream(), exception_state);
   ReadableStreamOperations::DefaultReaderRead(script_state_.Get(), reader);
 }
 
 void BodyStreamBuffer::Close() {
-  Controller()->Close();
+  if (auto* controller = Controller())
+    controller->Close();
   CancelConsumer();
 }
 
 void BodyStreamBuffer::GetError() {
   {
     ScriptState::Scope scope(script_state_.Get());
     Controller()->GetError(V8ThrowException::CreateTypeError(
         script_state_->GetIsolate(), "network error"));
   }
   CancelConsumer();
@@ skipping 91 matching lines @@
   }
   if (is_errored)
     return BytesConsumer::CreateErrored(BytesConsumer::Error("error"));
 
   DCHECK(consumer);
   consumer->ClearClient();
   return consumer;
 }
 
 }  // namespace blink