Network traffic annotation added to Service Worker unittests.

Network traffic annotation is added to network requests of:
content/browser/service_worker/service_worker_request_handler_unittest.cc
content/browser/service_worker/service_worker_url_request_job_unittest.cc

BUG=656607

Review-Url: https://codereview.chromium.org/2896793002
Cr-Commit-Position: refs/heads/master@{#473808}

content/browser/service_worker/service_worker_request_handler_unittest.cc

@@ -18,6 +18,7 @@
 #include "content/public/common/request_context_type.h"
 #include "content/public/common/resource_type.h"
 #include "content/public/test/test_browser_thread_bundle.h"
+#include "net/traffic_annotation/network_traffic_annotation_test_helper.h"
 #include "net/url_request/redirect_info.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_job.h"
@@ -63,7 +64,8 @@ class ServiceWorkerRequestHandlerTest : public testing::Test {
                                                  const std::string& method) {
     std::unique_ptr<net::URLRequest> request =
         url_request_context_.CreateRequest(GURL(url), net::DEFAULT_PRIORITY,
-                                           &url_request_delegate_);
+                                           &url_request_delegate_,
+                                           TRAFFIC_ANNOTATION_FOR_TESTS);
     request->set_method(method);
     return request;
   }

content/browser/service_worker/service_worker_url_request_job_unittest.cc

@@ -715,7 +715,7 @@ TEST_F(ServiceWorkerURLRequestJobTest, StreamResponseAndCancel) {
   version_->SetStatus(ServiceWorkerVersion::ACTIVATED);
   request_ = url_request_context_.CreateRequest(
       GURL("https://example.com/foo.html"), net::DEFAULT_PRIORITY,
-      &url_request_delegate_);
+      &url_request_delegate_, TRAFFIC_ANNOTATION_FOR_TESTS);
   request_->set_method("GET");
   request_->Start();
   EXPECT_FALSE(HasWork());