Refactoring DownloadManager::DownloadURL to add proper annotation.

content/browser/download/save_file_manager.cc

Index: content/browser/download/save_file_manager.cc
diff --git a/content/browser/download/save_file_manager.cc b/content/browser/download/save_file_manager.cc
index 256ef2811375b0a4eaffbd3518fda580fdf0e5b7..75182a58911f49c4e26245e580c7b7858833760f 100644
--- a/content/browser/download/save_file_manager.cc
+++ b/content/browser/download/save_file_manager.cc
@@ -25,6 +25,7 @@
 #include "content/public/common/previews_state.h"
 #include "net/base/io_buffer.h"
 #include "net/base/load_flags.h"
+#include "net/traffic_annotation/network_traffic_annotation.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_job_factory.h"
@@ -307,8 +308,29 @@ void SaveFileManager::OnSaveURL(const GURL& url,
     return;
   }
 
-  std::unique_ptr<net::URLRequest> request(
-      request_context->CreateRequest(url, net::DEFAULT_PRIORITY, NULL));
+  net::NetworkTrafficAnnotationTag traffic_annotation =
+      net::DefineNetworkTrafficAnnotation("...", R"(
+        semantics {
+          sender: "..."
+          description: "..."
+          trigger: "..."
+          data: "..."
+          destination: WEBSITE/GOOGLE_OWNED_SERVICE/OTHER/LOCAL
+        }
+        policy {
+          cookies_allowed: false/true
+          cookies_store: "..."
+          setting: "..."
+          chrome_policy {
+            [POLICY_NAME] {
+              policy_options {mode: MANDATORY/RECOMMENDED/UNSET}
+              [POLICY_NAME]: ... //(value to disable it)
+            }
+          }
+          policy_exception_justification: "..."
+        })");
+  std::unique_ptr<net::URLRequest> request(request_context->CreateRequest(
+      url, net::DEFAULT_PRIORITY, NULL, traffic_annotation));
   request->set_method("GET");
 
   // The URLRequest needs to be initialized with the referrer and other