Setup initial mock url request job tests for Cronet

components/cronet/android/test/cronet_tests_jni.cc

Index: components/cronet/android/test/cronet_tests_jni.cc
diff --git a/components/cronet/android/test/cronet_tests_jni.cc b/components/cronet/android/test/cronet_tests_jni.cc
index 88b2b8cf62041c896430ff1f6fec29f811d68fd1..6acf1fdf78568238516cc894c3710bff41b15a9e 100644
--- a/components/cronet/android/test/cronet_tests_jni.cc
+++ b/components/cronet/android/test/cronet_tests_jni.cc
@@ -8,6 +8,8 @@
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "components/cronet/android/cronet_loader.h"
+#include "cronet_mock_job_interceptor.h"
+#include "net/url_request/url_request_filter.h"
 
 namespace {
 
@@ -35,10 +37,13 @@ extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved) {
           arraysize(kCronetTestsRegisteredMethods))) {
     return -1;
   }
+
+  cronet::AddUrlInterceptors();
   return cronet_onload;
 }
 
 extern "C" void JNI_OnUnLoad(JavaVM* vm, void* reserved) {
+  net::URLRequestFilter::GetInstance()->ClearHandlers();
   cronet::CronetOnUnLoad(vm, reserved);
 }