Update RenderPreferences on GTK change.

chrome/browser/gtk/gtk_theme_provider.h

 // Copyright (c) 2009 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 CHROME_BROWSER_GTK_GTK_THEME_PROVIDER_H_
 #define CHROME_BROWSER_GTK_GTK_THEME_PROVIDER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 54 matching lines @@
   GdkColor GetGdkColor(int id) const;
 
   // A weighted average between the text color and the background color of a
   // label. Used for borders between GTK stuff and the webcontent.
   GdkColor GetBorderColor() const;
 
   // This method returns averages of the thumb part and of the track colors.
   // Used when rendering scrollbars.
   static void GetScrollbarColors(GdkColor* thumb_active_color,
                                  GdkColor* thumb_inactive_color,
-                                 GdkColor* track_color,
-                                 bool use_gtk_theme);
+                                 GdkColor* track_color);
 
   // Expose the inner label. Only used for testing.
   GtkWidget* fake_label() { return fake_label_.get(); }
 
   // Returns a CairoCachedSurface for a particular Display. CairoCachedSurfaces
   // (hopefully) live on the X server, instead of the client so we don't have
   // to send the image to the server on each expose.
   CairoCachedSurface* GetSurfaceNamed(int id, GtkWidget* widget_on_display);
 
-  // These functions do not add a ref to the returned pixbuf, and it should not be
-  // unreffed.
-  // If |native| is true, get the GTK_STOCK version of the icon.
+  // Returns colors that we pass to webkit to match the system theme.
+  const SkColor& get_focus_ring_color() const { return focus_ring_color_; }
+  const SkColor& get_thumb_active_color() const { return thumb_active_color_; }
+  const SkColor& get_thumb_inactive_color() const {
+    return thumb_inactive_color_;
+  }
+  const SkColor& get_track_color() const { return track_color_; }
+
+  // These functions do not add a ref to the returned pixbuf, and it should not
+  // be unreffed.  If |native| is true, get the GTK_STOCK version of the icon.
   static GdkPixbuf* GetFolderIcon(bool native);
   static GdkPixbuf* GetDefaultFavicon(bool native);
 
  private:
   typedef std::map<int, SkColor> ColorMap;
   typedef std::map<int, color_utils::HSL> TintMap;
   typedef std::map<int, SkBitmap*> ImageCache;
 
   // Load theme data from preferences, possibly picking colors from GTK.
   virtual void LoadThemePrefs();
 
   // Let all the browser views know that themes have changed.
   virtual void NotifyThemeChanged();
 
   // Additionally frees the CairoCachedSurfaces.
   virtual void FreePlatformCaches();
 
   // Handles signal from GTK that our theme has been changed.
   static void OnStyleSet(GtkWidget* widget,
                          GtkStyle* previous_style,
                          GtkThemeProvider* provider);
 
+  // Extracts colors and tints from the GTK theme, both for the
+  // BrowserThemeProvider interface and the colors we send to webkit.
   void LoadGtkValues();
 
+  // Sets the values that we send to webkit to safe defaults.
+  void LoadDefaultValues();
+
   // Sets the underlying theme colors/tints from a GTK color.
   void SetThemeColorFromGtk(int id, GdkColor* color);
   void SetThemeTintFromGtk(int id, GdkColor* color);
   void BuildTintedFrameColor(int color_id, int tint_id);
   void SetTintToExactColor(int id, GdkColor* color);
 
   // Split out from FreePlatformCaches so it can be called in our destructor;
   // FreePlatformCaches() is called from the BrowserThemeProvider's destructor,
   // but by the time ~BrowserThemeProvider() is run, the vtable no longer
   // points to GtkThemeProvider's version.
@@ skipping 24 matching lines @@
 
   // A list of all GtkChromeButton instances. We hold on to these to notify
   // them of theme changes.
   std::vector<GtkWidget*> chrome_buttons_;
 
   // Tints and colors calculated by LoadGtkValues() that are given to the
   // caller while |use_gtk_| is true.
   ColorMap colors_;
   TintMap tints_;
 
+  // Colors that we pass to WebKit. These are generated each time the theme
+  // changes.
+  SkColor focus_ring_color_;
+  SkColor thumb_active_color_;
+  SkColor thumb_inactive_color_;
+  SkColor track_color_;
+
   // Image cache of lazily created images, created when requested by
   // GetBitmapNamed().
   mutable ImageCache gtk_images_;
 
   // Cairo surfaces for each GdkDisplay.
   typedef std::map<int, CairoCachedSurface*> CairoCachedSurfaceMap;
   typedef std::map<GdkDisplay*, CairoCachedSurfaceMap> PerDisplaySurfaceMap;
   PerDisplaySurfaceMap per_display_surfaces_;
 
   // This is a dummy widget that only exists so we have something to pass to
   // gtk_widget_render_icon().
   static GtkWidget* icon_widget_;
 
   // The default folder icon and default bookmark icon for the GTK theme.
   // These are static because the system can only have one theme at a time.
   // They are cached when they are requested the first time, and cleared when
   // the system theme changes.
   static GdkPixbuf* default_folder_icon_;
   static GdkPixbuf* default_bookmark_icon_;
 };
 
 #endif  // CHROME_BROWSER_GTK_GTK_THEME_PROVIDER_H_