mus: Introduce high-contrast mode in mus.

ash/mus/bridge/wm_shell_mus.cc

Index: ash/mus/bridge/wm_shell_mus.cc
diff --git a/ash/mus/bridge/wm_shell_mus.cc b/ash/mus/bridge/wm_shell_mus.cc
index 582e75000da983f3d73a1f2246e655e823cc131f..b9626529759b2ad657d98e7bc909056ddf7d29fb 100644
--- a/ash/mus/bridge/wm_shell_mus.cc
+++ b/ash/mus/bridge/wm_shell_mus.cc
@@ -22,9 +22,11 @@
 #include "ash/mus/root_window_controller.h"
 #include "base/memory/ptr_util.h"
 #include "components/user_manager/user_info_impl.h"
+#include "services/shell/public/cpp/connector.h"
 #include "services/ui/common/util.h"
 #include "services/ui/public/cpp/window.h"
 #include "services/ui/public/cpp/window_tree_client.h"
+#include "services/ui/public/interfaces/accessibility_manager.mojom.h"
 
 namespace ash {
 namespace mus {
@@ -90,11 +92,39 @@ class SessionStateDelegateStub : public SessionStateDelegate {
   DISALLOW_COPY_AND_ASSIGN(SessionStateDelegateStub);
 };
 
+class AccessibilityDelegateMus : public DefaultAccessibilityDelegate {
+ public:
+  explicit AccessibilityDelegateMus(shell::Connector* connector)
+      : connector_(connector) {}
+  ~AccessibilityDelegateMus() override {}
+
+ private:
+  ui::mojom::AccessibilityManager* GetAccessibilityManager() {
+    if (!accessibility_manager_ptr_.is_bound())
+      connector_->ConnectToInterface("mojo:ui", &accessibility_manager_ptr_);
+    return accessibility_manager_ptr_.get();
+  }
+
+  // DefaultAccessibilityDelegate:
+  void ToggleHighContrast() override {
+    DefaultAccessibilityDelegate::ToggleHighContrast();
+    GetAccessibilityManager()->SetHighContrastMode(IsHighContrastEnabled());
+  }
+
+  ui::mojom::AccessibilityManagerPtr accessibility_manager_ptr_;
+  shell::Connector* connector_;
+
+  DISALLOW_COPY_AND_ASSIGN(AccessibilityDelegateMus);
+};
+
 }  // namespace
 
-WmShellMus::WmShellMus(ShellDelegate* delegate, ::ui::WindowTreeClient* client)
+WmShellMus::WmShellMus(ShellDelegate* delegate,
+                       ::ui::WindowTreeClient* client,
+                       shell::Connector* connector)
     : WmShell(delegate),
       client_(client),
+      connector_(connector),
       session_state_delegate_(new SessionStateDelegateStub) {
   client_->AddObserver(this);
   WmShell::Set(this);
@@ -103,7 +133,7 @@ WmShellMus::WmShellMus(ShellDelegate* delegate, ::ui::WindowTreeClient* client)
 
   CreateMruWindowTracker();
 
-  accessibility_delegate_.reset(new DefaultAccessibilityDelegate);
+  accessibility_delegate_.reset(new AccessibilityDelegateMus(connector_));
   SetSystemTrayDelegate(base::WrapUnique(new DefaultSystemTrayDelegate));
 }