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 76c353ccdcf98ba568ce100392e6f4e9bbfb5070..2276835350e56da06c1d875d94c6a403f991f06c 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.cc
+++ b/extensions/browser/guest_view/web_view/web_view_guest.cc
@@ -39,6 +39,7 @@
 #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"
@@ -172,10 +173,14 @@ 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,