Small optimization for <webview> tooltips.

content/browser/browser_plugin/browser_plugin_guest.h

Index: content/browser/browser_plugin/browser_plugin_guest.h
diff --git a/content/browser/browser_plugin/browser_plugin_guest.h b/content/browser/browser_plugin/browser_plugin_guest.h
index a54c0ccfe999a91985c7a8f502ba09496b2854ca..a5565463d41b5c4a75bc7655df552032d89eb658 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.h
+++ b/content/browser/browser_plugin/browser_plugin_guest.h
@@ -324,6 +324,9 @@ class CONTENT_EXPORT BrowserPluginGuest : public WebContentsObserver {
   // Forwards all messages from the |pending_messages_| queue to the embedder.
   void SendQueuedMessages();
 
+  // The last tooltip that was set with SetTooltipText().
+  base::string16 current_tooltip_text_;
+
   scoped_ptr<EmbedderWebContentsObserver> embedder_web_contents_observer_;
   WebContentsImpl* embedder_web_contents_;