Draw background of Linux extension toolstrips.

chrome/browser/gtk/extension_view_gtk.h

Index: chrome/browser/gtk/extension_view_gtk.h
diff --git a/chrome/browser/gtk/extension_view_gtk.h b/chrome/browser/gtk/extension_view_gtk.h
index 495039d2d00395f6794f1f15b2606467403aef69..7612c94091978272aa45483148ec5ec7cdf6b90d 100644
--- a/chrome/browser/gtk/extension_view_gtk.h
+++ b/chrome/browser/gtk/extension_view_gtk.h
@@ -12,6 +12,7 @@ class Browser;
 class ExtensionHost;
 class RenderViewHost;
 class RenderWidgetHostViewGtk;
+class SkBitmap;
 
 class ExtensionViewGtk {
  public:
@@ -25,6 +26,8 @@ class ExtensionViewGtk {
   bool is_toolstrip() const { return is_toolstrip_; }
   void set_is_toolstrip(bool is_toolstrip) { is_toolstrip_ = is_toolstrip; }
 
+  void SetBackground(const SkBitmap& background);
+
   // Method for the ExtensionHost to notify us about the correct width for
   // extension contents.
   void UpdatePreferredWidth(int pref_width);