Cache the current WebPreferences on RenderViewHostImpl.

content/browser/renderer_host/render_view_host_impl.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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 186 matching lines @@
   virtual SiteInstance* GetSiteInstance() const OVERRIDE;
   virtual bool IsRenderViewLive() const OVERRIDE;
   virtual void NotifyMoveOrResizeStarted() OVERRIDE;
   virtual void SetWebUIProperty(const std::string& name,
                                 const std::string& value) OVERRIDE;
   virtual void Zoom(PageZoom zoom) OVERRIDE;
   virtual void SyncRendererPrefs() OVERRIDE;
   virtual WebPreferences GetWebkitPreferences() OVERRIDE;
   virtual void UpdateWebkitPreferences(
       const WebPreferences& prefs) OVERRIDE;
+  virtual void OnWebkitPreferencesChanged() OVERRIDE;
   virtual void GetAudioOutputControllers(
       const GetAudioOutputControllersCallback& callback) const OVERRIDE;
   virtual void SelectWordAroundCaret() OVERRIDE;
 
 #if defined(OS_ANDROID)
   virtual void ActivateNearestFindResult(int request_id,
                                          float x,
                                          float y) OVERRIDE;
   virtual void RequestFindMatchRects(int current_version) OVERRIDE;
 #endif
@@ skipping 17 matching lines @@
                                 int opener_route_id,
                                 int proxy_route_id,
                                 int32 max_page_id,
                                 bool window_was_created_with_opener);
 
   base::TerminationStatus render_view_termination_status() const {
     return render_view_termination_status_;
   }
 
   // Returns the content specific prefs for this RenderViewHost.
-  WebPreferences GetWebkitPrefs(const GURL& url);
+  WebPreferences ComputeWebkitPrefs(const GURL& url);
 
   // Sends the given navigation message. Use this rather than sending it
   // yourself since this does the internal bookkeeping described below. This
   // function takes ownership of the provided message pointer.
   //
   // If a cross-site request is in progress, we may be suspended while waiting
   // for the onbeforeunload handler, so this function might buffer the message
   // rather than sending it.
   // TODO(nasko): Remove this method once all callers are converted to use
   // RenderFrameHostImpl.
@@ skipping 345 matching lines @@
   // Called after receiving the SwapOutACK when the RVH is in state pending
   // shutdown. Also called if the unload timer times out.
   // TODO(nasko): Move to RenderFrameHost, as this is per-frame state.
   base::Closure pending_shutdown_on_swap_out_;
 
   base::WeakPtrFactory<RenderViewHostImpl> weak_factory_;
 
   // True if the current focused element is editable.
   bool is_focused_element_editable_;
 
+  // This is updated every time UpdateWebkitPreferences is called. That method
+  // is in turn called when any of the settings change that the WebPreferences
+  // values depend on.
+  scoped_ptr<WebPreferences> web_preferences_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_