Network traffic annotation added to chrome::BitmapFetcher.

chrome/browser/autocomplete/chrome_autocomplete_provider_client.cc

Index: chrome/browser/autocomplete/chrome_autocomplete_provider_client.cc
diff --git a/chrome/browser/autocomplete/chrome_autocomplete_provider_client.cc b/chrome/browser/autocomplete/chrome_autocomplete_provider_client.cc
index 12d6b2f1c50ade6f3d7ab02dd611ca7995ebf8eb..6e92cac8697a1f0df02ad66eaddd3add0a492de2 100644
--- a/chrome/browser/autocomplete/chrome_autocomplete_provider_client.cc
+++ b/chrome/browser/autocomplete/chrome_autocomplete_provider_client.cc
@@ -34,6 +34,7 @@
 #include "components/sync/driver/sync_service_utils.h"
 #include "content/public/browser/notification_service.h"
 #include "extensions/features/features.h"
+#include "net/traffic_annotation/network_traffic_annotation.h"
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/autocomplete/keyword_extensions_delegate_impl.h"
@@ -248,7 +249,27 @@ void ChromeAutocompleteProviderClient::PrefetchImage(const GURL& url) {
   BitmapFetcherService* image_service =
       BitmapFetcherServiceFactory::GetForBrowserContext(profile_);
   DCHECK(image_service);
-  image_service->Prefetch(url);
+  net::NetworkTrafficAnnotationTag traffic_annotation =
+      net::DefineNetworkTrafficAnnotation("", R"(
+        semantics {
+          sender: ""
+          description: ""
+          trigger: ""
+          data: ""
+          destination: WEBSITE/GOOGLE_OWNED_SERVICE/OTHER
+        }
+        policy {
+          cookies_allowed: false/true
+          cookies_store: ""
+          setting: ""
+          policy {
+            [POLICY_NAME] {
+                policy_options {mode: MANDATORY/RECOMMENDED/UNSET}
+                value: ...
+            }
+          }
+        })");
+  image_service->Prefetch(url, traffic_annotation);
 }
 
 void ChromeAutocompleteProviderClient::OnAutocompleteControllerResultReady(