Small optimization for <webview> tooltips.

content/browser/browser_plugin/browser_plugin_guest.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A BrowserPluginGuest is the browser side of a browser <--> embedder
 // renderer channel. A BrowserPlugin (a WebPlugin) is on the embedder
 // renderer side of browser <--> embedder renderer communication.
 //
 // BrowserPluginGuest lives on the UI thread of the browser process. Any
 // messages about the guest render process that the embedder might be interested
@@ skipping 306 matching lines @@
 #endif
   void OnShowWidget(int route_id, const gfx::Rect& initial_pos);
   void OnTakeFocus(bool reverse);
   void OnUpdateFrameName(int frame_id,
                          bool is_top_level,
                          const std::string& name);
 
   // 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_;
 
   // An identifier that uniquely identifies a browser plugin within an embedder.
   int browser_plugin_instance_id_;
   float guest_device_scale_factor_;
   gfx::Rect guest_window_rect_;
   bool focused_;
   bool mouse_locked_;
   bool pending_lock_request_;
@@ skipping 39 matching lines @@
   // Weak pointer used to ask GeolocationPermissionContext about geolocation
   // permission.
   base::WeakPtrFactory<BrowserPluginGuest> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginGuest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_H_