GuestViews should be able to specify task manager entries

extensions/browser/guest_view/web_view/web_view_guest.cc

Index: extensions/browser/guest_view/web_view/web_view_guest.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_guest.cc b/extensions/browser/guest_view/web_view/web_view_guest.cc
index 5eaf6b40ea3f59bc4a03bde02ad1f9494da2a887..c6d870a8ffa2460e6023e9f8abd2fcf023d169a6 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.cc
+++ b/extensions/browser/guest_view/web_view/web_view_guest.cc
@@ -40,6 +40,7 @@
 #include "extensions/browser/guest_view/web_view/web_view_renderer_state.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension_messages.h"
+#include "extensions/strings/grit/extensions_strings.h"
 #include "ipc/ipc_message_macros.h"
 #include "net/base/escape.h"
 #include "net/base/net_errors.h"
@@ -173,10 +174,14 @@ int WebViewGuest::GetViewInstanceId(WebContents* contents) {
   return guest->view_instance_id();
 }
 
-const char* WebViewGuest::GetAPINamespace() {
+const char* WebViewGuest::GetAPINamespace() const {
   return webview::kAPINamespace;
 }
 
+int WebViewGuest::GetTaskPrefix() const {
+  return IDS_EXTENSION_TASK_MANAGER_WEBVIEW_TAG_PREFIX;
+}
+
 void WebViewGuest::CreateWebContents(
     const std::string& embedder_extension_id,
     int embedder_render_process_id,