Show a different icon in the launcher for incognito windows

ash/launcher/tabbed_launcher_button.h

Index: ash/launcher/tabbed_launcher_button.h
diff --git a/ash/launcher/tabbed_launcher_button.h b/ash/launcher/tabbed_launcher_button.h
index 44917b7f76290de403e07e34a4cbfdf54df54c6e..9958b0428fe93fb2740317bd101f56ab2e61b428 100644
--- a/ash/launcher/tabbed_launcher_button.h
+++ b/ash/launcher/tabbed_launcher_button.h
@@ -17,6 +17,9 @@ class MultiAnimation;
 }
 
 namespace ash {
+
+class LauncherItem;
+
 namespace internal {
 
 class LauncherButtonHost;
@@ -32,7 +35,7 @@ class TabbedLauncherButton : public views::ImageButton {
   void PrepareForImageChange();
 
   // Sets the images to display for this entry.
-  void SetTabImage(const SkBitmap& image, int count);
+  void SetTabImage(const LauncherItem& item);
 
  protected:
   // View overrides:
@@ -90,11 +93,15 @@ class TabbedLauncherButton : public views::ImageButton {
   bool show_image_;
 
   // Background images. Which one is chosen depends upon how many images are
-  // provided.
+  // provided and if the browser window is incognito.
   static ImageSet* bg_image_1_;
   static ImageSet* bg_image_2_;
   static ImageSet* bg_image_3_;
 
+  static ImageSet* bg_private_image_1_;
+  static ImageSet* bg_private_image_2_;
+  static ImageSet* bg_private_image_3_;
+
   views::GlowHoverController hover_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(TabbedLauncherButton);