Implement High Contrast mode for Chrome OS

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index 2f47db3046e4942f9ab32c49b14bfce1804dee29..5107b3520ecf1e4db7983aa28095bccf27ce1d3c 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -68,6 +68,7 @@ class AppList;
 class DragDropController;
 class EventClientImpl;
 class FocusCycler;
+class HighContrastController;
 class InputMethodEventFilter;
 class KeyRewriterEventFilter;
 class MagnificationController;
@@ -234,9 +235,14 @@ class ASH_EXPORT Shell {
     return user_wallpaper_delegate_.get();
   }
 
+  internal::HighContrastController* high_contrast_controller() {
+    return high_contrast_controller_.get();
+  }
+
   internal::MagnificationController* magnification_controller() {
     return magnification_controller_.get();
   }
+
   internal::ScreenDimmer* screen_dimmer() {
     return screen_dimmer_.get();
   }
@@ -342,6 +348,7 @@ class ASH_EXPORT Shell {
   scoped_ptr<internal::FocusCycler> focus_cycler_;
   scoped_ptr<internal::EventClientImpl> event_client_;
   scoped_ptr<internal::MonitorController> monitor_controller_;
+  scoped_ptr<internal::HighContrastController> high_contrast_controller_;
   scoped_ptr<internal::MagnificationController> magnification_controller_;
   scoped_ptr<internal::ScreenDimmer> screen_dimmer_;