GuestViews should be able to specify task manager entries

extensions/browser/guest_view/app_view/app_view_guest.cc

Index: extensions/browser/guest_view/app_view/app_view_guest.cc
diff --git a/extensions/browser/guest_view/app_view/app_view_guest.cc b/extensions/browser/guest_view/app_view/app_view_guest.cc
index f0ed485336f3caf3a3cf42e5aeed25b393d996dc..7232583d37c2d8b165ea607ff3f671efe972177e 100644
--- a/extensions/browser/guest_view/app_view/app_view_guest.cc
+++ b/extensions/browser/guest_view/app_view/app_view_guest.cc
@@ -21,6 +21,7 @@
 #include "extensions/common/api/app_runtime.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/switches.h"
+#include "extensions/strings/grit/extensions_strings.h"
 #include "ipc/ipc_message_macros.h"
 
 namespace app_runtime = extensions::core_api::app_runtime;
@@ -132,10 +133,14 @@ bool AppViewGuest::HandleContextMenu(const content::ContextMenuParams& params) {
   return false;
 }
 
-const char* AppViewGuest::GetAPINamespace() {
+const char* AppViewGuest::GetAPINamespace() const {
   return appview::kEmbedderAPINamespace;
 }
 
+int AppViewGuest::GetTaskPrefix() const {
+  return IDS_EXTENSION_TASK_MANAGER_APPVIEW_TAG_PREFIX;
+}
+
 void AppViewGuest::CreateWebContents(
     const std::string& embedder_extension_id,
     int embedder_render_process_id,