GuestViews should be able to specify task manager entries

chrome/browser/guest_view/web_view/web_view_guest.cc

Index: chrome/browser/guest_view/web_view/web_view_guest.cc
diff --git a/chrome/browser/guest_view/web_view/web_view_guest.cc b/chrome/browser/guest_view/web_view/web_view_guest.cc
index 98a606b615c2f775e9a2b6a0785677efe70ba07f..8ca8d6ff0ab69697a58ba58090fbd467f2f679ca 100644
--- a/chrome/browser/guest_view/web_view/web_view_guest.cc
+++ b/chrome/browser/guest_view/web_view/web_view_guest.cc
@@ -187,10 +187,16 @@ 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 {
+  if (!web_view_guest_delegate_)
+    return 0;

[Charlie Reis, 2014/08/25 20:25:41]

Could we use IDS_TASK_MANAGER_WEBVIEW_TAG_PREFIX ("Webview:") instead of 0?  It
sounds like that might be a reasonable default for WebViewGuest, based on the
class name, and then we wouldn't need to worry about whether 0 is a valid task
prefix or not.

[Fady Samuel, 2014/08/25 23:05:52]

Done.

+  return web_view_guest_delegate_->GetTaskPrefix();
+}
+
 void WebViewGuest::CreateWebContents(
     const std::string& embedder_extension_id,
     int embedder_render_process_id,