Fix a pair of Cronet upload bugs and add tests.

components/cronet/android/test/cronet_test_jni.cc

Index: components/cronet/android/test/cronet_test_jni.cc
diff --git a/components/cronet/android/test/cronet_test_jni.cc b/components/cronet/android/test/cronet_test_jni.cc
index dcade5e52a3ccf22c8cdf6909addf27e33965cff..3bbaa676901882646d69b97e659017efe10ad212 100644
--- a/components/cronet/android/test/cronet_test_jni.cc
+++ b/components/cronet/android/test/cronet_test_jni.cc
@@ -9,11 +9,13 @@
 #include "base/android/jni_registrar.h"
 #include "components/cronet/android/cronet_loader.h"
 #include "mock_url_request_job_util.h"
+#include "upload_test_server.h"
 
 namespace {
 
 const base::android::RegistrationMethod kCronetTestsRegisteredMethods[] = {
   {"MockURLRequestJobUtil", cronet::RegisterMockUrlRequestJobUtil},
+  {"RegisterUploadTestServer", cronet::RegisterUploadTestServer},
 };
 
 }  // namespace