provide option to set content for POST request with url_fetcher

atom/browser/net/url_request_fetch_job.cc

@@ -90,12 +90,14 @@ void URLRequestFetchJob::StartAsync(scoped_ptr<base::Value> options) {
 
   std::string url, method, referrer;
   base::Value* session = nullptr;
+  base::DictionaryValue* upload_data = nullptr;
   base::DictionaryValue* dict =
       static_cast<base::DictionaryValue*>(options.get());
   dict->GetString("url", &url);
   dict->GetString("method", &method);
   dict->GetString("referrer", &referrer);
   dict->Get("session", &session);
+  dict->GetDictionary("uploadData", &upload_data);
 
   // Check if URL is valid.
   GURL formated_url(url);
@@ -127,6 +129,14 @@ void URLRequestFetchJob::StartAsync(scoped_ptr<base::Value> options) {
   else
     fetcher_->SetReferrer(referrer);
 
+  // Set the data needed for POSTs.
+  if (upload_data && request_type == net::URLFetcher::POST) {
+    std::string content_type, data;
+    upload_data->GetString("contentType", &content_type);
+    upload_data->GetString("data", &data);
+    fetcher_->SetUploadData(content_type, data);
+  }
+
   // Use |request|'s headers.
   fetcher_->SetExtraRequestHeaders(
       request()->extra_request_headers().ToString());

docs/api/protocol.md

@@ -103,11 +103,16 @@ Registers a protocol of `scheme` that will send a `String` as a response. The
 
 Registers a protocol of `scheme` that will send an HTTP request as a response.
 The `callback` should be called with an object that has the `url`, `method`,
-`referrer`, and `session` properties.
+`referrer`, `uploadData` and `session` properties.
 
 By default the HTTP request will reuse the current session. If you want the
 request to have a different session you should set `session` to `null`.
 
+POST request should provide an `uploadData` object.
+* `uploadData` object
+  * `contentType` String - MIME type of the content.
+  *  `data` String - Content to be sent.
+
 ### `protocol.unregisterProtocol(scheme[, completion])`
 
 * `scheme` String