Support 'URLSearchParams' as the body of a Request

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

Index: third_party/WebKit/Source/modules/fetch/RequestInit.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/RequestInit.cpp b/third_party/WebKit/Source/modules/fetch/RequestInit.cpp
index 98b3dea0e168604466591e3dfbf3ed795b65b326..d041edfe7fea8d2b159ffa404c6bfe196be9a3dc 100644
--- a/third_party/WebKit/Source/modules/fetch/RequestInit.cpp
+++ b/third_party/WebKit/Source/modules/fetch/RequestInit.cpp
@@ -11,6 +11,7 @@
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8Blob.h"
 #include "bindings/core/v8/V8FormData.h"
+#include "bindings/core/v8/V8URLSearchParams.h"
 #include "core/fileapi/Blob.h"
 #include "core/html/FormData.h"
 #include "modules/fetch/FetchBlobDataConsumerHandle.h"
@@ -78,6 +79,10 @@ RequestInit::RequestInit(ExecutionContext* context, const Dictionary& options, E
         // FormDataEncoder::generateUniqueBoundaryString.
         contentType = AtomicString("multipart/form-data; boundary=", AtomicString::ConstructFromLiteral) + formData->boundary().data();
         body = FetchFormDataConsumerHandle::create(context, formData.release());
+    } else if (V8URLSearchParams::hasInstance(v8Body, isolate)) {
+        RefPtr<EncodedFormData> formData = V8URLSearchParams::toImpl(v8::Local<v8::Object>::Cast(v8Body))->encodeFormData();
+        contentType = AtomicString("application/x-www-form-urlencoded;charset=UTF-8", AtomicString::ConstructFromLiteral);
+        body = FetchFormDataConsumerHandle::create(context, formData.release());
     } else if (v8Body->IsString()) {
         contentType = "text/plain;charset=UTF-8";
         body = FetchFormDataConsumerHandle::create(toUSVString(isolate, v8Body, exceptionState));