A11y: Introduce High Contrast Mode and Screen Magnifier to ubar tray.

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index 42311caa870d29ec7841fde655152176528e6485..dfc5f865afdce81e92da5976e31dda1e0d2f32c3 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -22,7 +22,9 @@ ShellDelegateImpl::ShellDelegateImpl()
     : watcher_(NULL),
       launcher_delegate_(NULL),
       locked_(false),
-      spoken_feedback_enabled_(false) {
+      spoken_feedback_enabled_(false),
+      high_contrast_enabled_(false),
+      screen_magnifier_type_(MAGNIFIER_OFF) {
 }
 
 ShellDelegateImpl::~ShellDelegateImpl() {
@@ -122,6 +124,26 @@ bool ShellDelegateImpl::IsSpokenFeedbackEnabled() const {
   return spoken_feedback_enabled_;
 }
 
+void ShellDelegateImpl::ToggleHighContrast() {
+  high_contrast_enabled_ = !high_contrast_enabled_;
+}
+
+bool ShellDelegateImpl::IsHighContrastEnabled() const {
+  return high_contrast_enabled_;
+}
+
+void ShellDelegateImpl::SetScreenMagnifier(MagnifierType type) {
+  screen_magnifier_type_ = type;
+}
+
+bool ShellDelegateImpl::GetMagnifierType() const {
+  return screen_magnifier_type_;
+}
+
+bool ShellDelegateImpl::ShouldAlwaysShowAccessibilityMenu() const {
+  return false;
+}
+
 app_list::AppListViewDelegate* ShellDelegateImpl::CreateAppListViewDelegate() {
   return ash::shell::CreateAppListViewDelegate();
 }